Welcome to the forum
It does sound like the cooling unit has hit the trail. Take the lower access panel off and make sure you DON’T see any yellow powder. If you do, leave it alone you need a new cooling unit.
If you don’t, then turn it on (either will do) and wait about 20 minutes. After 20 minutes, CAREFULLY feel the chimney and make sure it’s hot. Then move over and feel the coils and lower tank. If the top of the coils are hot and the bottom tank isn’t warm you probably have a blockage. You may get lucky by tapping the coils with a rubber mallet, but I’m leaning towards a failed unit.
You can get rebuilt units for less than the cost of the fridge, or you might consider changing to a compressor style cooling unit if these people have one that fits your model.
https://jc-refrigeration.com/
They make high quality products, we have installed 2 so far and have had stellar results.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.