The Good Sam's tech came yesterday.  Now we have to wait for the approval.  

The actual removal took 4 hours helped I am sure by Gerald's instructions. The HVAC tech Alliance brought in said the copper tubes had "blown off" the compressors because the evaporator coils were dirty !!  They are not that dirty.
Pics are under topic  heading 2000 Beaver Marquis Amethyst basement air conditioning   http://forum.bacrallies.com/m-1280444594/
Opinions on this website disagree  with the HVAC tech at Alliance Coach and offer the explanation that SCS discovered a design flaw 5 to 6 years ago with the rigid copper tubing fracturing and started installing flexible tubing instead.  
The issue now rests with Good Sam's Extended warranty Gold Plan which I have.

Jeramy,

It is true that gas pressure can increase significantly with temperature and these are balanced systems in a sense. They rely on air flow to keep the pressure in check. The condenser, evaporator, and fan air flow are designed to work within the limits of the compressor capability and tolerances of the rest of the components. As air flow is restricted, either by dirt or bent fins, in the condensor, you work the system much harder with higher pressures and also reduce the overall cooling performance. There is a comb tool that the HVAC folks have that can straighten the condenser fins. While he has it out the fins should be straightened and you should be sure that the condenser has been cleaned. From what I saw in your photos the dirt level did not obscure the tubes so my guess is there should have been reasonable air flow. I have to assume that the other side of the condenser was similar in appearance but maybe not given that looks to be the side air flow eminates from.

From a failure analysis point of view, what one would expect if this was a pressure fail, is that the weakest pressure component in the system would fail. Usually in a HVAc system there is a means of excessive pressure relief, sometimes a metal plug in the dessicant container. If your weakest pressure point was the copper, it would have produced bulging and thinning walls at first, followed by the thinnest point giving way, blowing outward.  I see none of that indication here in your photos. This looks like a metal fatigue fail due to the vibration of the compressor causing the metal to fatigue and fracture. Soft thick wall copper would be better a better choice and perhaps some means of tubing support at some distance above the compressor, to dampen the copper pipe amount of vibration would help. The photos show a tall vertical run of unsuspended copper tubing left to oscillate which can accelerate the metal fatigue fail. The compressor is the vibration generator but the moment arm of unsuspended piping can actually be the root cause. Hope this helps.

later Ed

Hi Ed,
  I am sure you are right.  There is no evidence of a bulging or  explosion; rather a fatigue fracture  and not one but two !!   It remains to be seen whether Good Sams  will go with the  Alliance Coach outside techs report  or the evidence in the pics!!  
Alliance Coach are asking for a new RVP 27,000 btu  unit to be installed.
We are hoping to be mobile by next weekend.

Good Sam's (Gold Extended Warranty Plan) approved the claim to include installation of a new RVP 46515-811 $3257 a/c unit and a maximum of 8 hours labour.  The diagnosis was not included.  We have 3/4 hour in hand .
The RVP unit is a different size from the SCS unit.  More hours are needed to configure the filter housing, cold air output, 120 VAC connections, thermostat, etc.  I am assured Alliance Coach will work with us on the final bill, as they want us to leave happy.

Alliance Coach is going to reconfigure the 24,000btu RVP # 46515-811 $3257 unit to fit, which Good Sams approved as a replacement. The 27,000 btu unit was far too large to fit without severe modifications.
They have used almost all of the 8 hours Good Sam allowed for this job.
We are assured, they will work with with us on the hours billed, as they want us to be happy with the final outcome. Pics of this job are under 2000 Beaver Marquis Amethyst basement air conditioning.....
It was decided, rebuilding the old SCS unit was not a viable  option.
I have since been told that Beaver Coach Sales, rebuilds old SCS units for $3000, using your unit as a core.  However, it is obvious the New RVP unit is far superior in performance, even though it will cost to install.

Thursday June 2nd.
  Alliance Coach has removed the forward wall/bulkhead that supports the tray  to allow the RVP a/c unit to swivel into position. They now have to fabricate a thinner support bulkhead as the RVP unit is longer than the old SCS unit. Once the bulkhead is installed, they will hook up the modified RVP unit to the old ducting, connect the 2 110v ac power supplies and install the new RVP thermostat.  

Wednesday June 8th. 2011. Day 9 .
  Alliance Coach has told me the following:  " The a/c is ducted, wired and running; it is really cold; in a 1/2 hour while it was 95 degrees outside the coach was cooled down to 65 degrees. They also said the RVP unit is very quiet.
This might interest some of us who have to let the SCS unit run all day and night, to keep the coach at 80 deg F plus when its over 95 deg F outside.
   They could not reposition the thermostat for a faster installation, as the Hurricane Furnace wiring runs inside the slide wall to the same location, which meant they had to remove the wall to run the new thermostat wiring.  The Technician has to reinstall the wall, after installing the thermostat and button things up .
It  is quite possible he will be done today .

Friday June 10th 2011.
Job was completed this  morning. We will pick up the coach Monday 13th !!

Thursday 23rd June 2011.
  After 57 hours work, not including the 8 hours Good Sam allowed for R&R of the old SCS unit, the new RVP 24,000 BTU basement air conditioner is installed and running.
The main problems were, having to alter the units cold air output and the return air inlet from the coach. After the RVP was installed,  Alliance had to  R&R  the unit to add bracing to the cold air blower squirrel cage, to stop the blower wheel from touching the side of the housing.  This was done at no cost, under the 30 day warranty, after consultations with Coleman.
It meant a return visit to Alliance Coach  for 3 days.  
We are now in Clayton. NY, and the unit is running amazingly well.
Alliance Coach was very good to us as far as the final bill was concerned.  We settled for just under $3000, which included the $500 deductible for Good Sam, who picked up the bill for the new unit and the initial 8  hours labor,for diagnosis and removal of the old SCS unit.  
Alliance Coach is well aware many of us are watching this site and might find ourselves needing this upgrade in the future.
Now they have this experience under their belt, I would recommend anyone needing this upgrade, go to Alliance Coach.  Just be aware some coaches are different from our Beaver Marquis Amethyst, and might require slightly different configuration.
Overall, a very frustrating experience, but the outcome is well worth it.
The new Coleman RVP 24,000 btu unit is way more efficient than the old 27,000 btu SCS unit.  It cools the coach down after a hot days run in less than 10 minutes.  At 95 deg outside temps, it keeps us cool at   77 degF.or lower.
It is much quieter than the SCS unit, inside and outside. Parked next to another RV, we no longer blow them off their site or drown out their conversations.
If anyone wants further info, please email me at: svpelican1@hot mail.com