I've got the same refrigerator in our Montana High Country. It failed on our shakedown trip. Took it to the dealer. They tried 3 times over a 6 week period. I took it to a family owned and operated RV shop. They only sell parts and do repairs. They replaced the cooling system under Dometic warranty.
I think it has a 2 year warranty. Be sure you are registered with Dometic. Call them and give them the model and serial numbers. They also offer extended warranties on the refrigerator and A/C.
I would look around for an independent repair shop that is authorized to do warranty work on Dometic. Ask neighbors that have RV's or at local RV parks. The dealer has little incentive to fix anything. They usually don't pay enough to keep good techs. They are focused on making their money in the sales showroom.
There is a thread about adding fans on keystonerv.org. I need to add one as well.