I have zero trouble shooting experience on residential frigs. I guess the good news is that a regular appliance repair person can probably figure it out which could be cheaper than an RV facility.
We recently had the 18 month old frig in our home quit cooling. Repairmen came and took one look at compressor and coils and knew there was some type of blockage and needed a new compressor. It took him about 5 minutes to figure it out.
Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO