I have a 2002 Marlin with a Isotherm refrigerator that has quit cooling. I have recharged it. It cooled for a while, now I think the compressor has gone bad. Before I keep spending money on an old unit, has anyone replaced theirs? I found a Norcold that is the same size, but does not have the angled bottom in the back. It is about 18 " deep, and I think it might hit on the bottom rear.Has anyone replaced theirs?