Others with more experience should jump in also. I've had my local a/c guy recharge and do some work on mine. You should know that Dometic considers these obsolete but there are some parts still available. Newell factory has some parts, blower fan motors, maybe control boards. Don't think they have compressors or cores but there is a guy in Indiana (can't find his info just yet, I'll keep looking) that used to work for Dometic and has a repair shop. He has some parts available.
One of the frequent problems is the blower fan on the compressor coils (in the basement) fails. Check to see if the compressor is running or getting hot, if the fan is not running it's probably that fan motor.
Richard found a problem with some of his wiring connections loose. Check those.
Since these are split units (just like a house central a/c) you have a fan motor on the compressor and another on the evaporator inside. Hope this helps with troubleshooting.
Good luck.
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