Thanks for the info - the answer to the thermostat question is what I needed. The recall has been performed - I checked the circuit board part number.
This is a project rig that I picked up for $200 (Allegro M30). I've got around $2500 into the restoration (mostly in the new engine and 6 new tires) and it's finally road-ready. Everything works wonderfully except for the fridge. I'd like to fix it inexpensively - I don't plan to have this thing for more than a few years.
I can replace the cooling unit, thermostat and circuit board for half the cost of a replacement fridge if I had to. The Norcold replacement fridge is $1,200. The cooling unit is $425, circuit board is $90 and the thermostat is $75. The heating element works as does the propane. Chimney is in good shape, door seals are so-so. I'd like to get a new fridge, but it doesn't make sense to spend that much on this rig - so long as I can repair it safely. I had been looking around for a used one, but chances are it would have the same problem.