Mr. Wizard is probably right about it being two different problems. As far as the refer goes, along wih his excellent advice, you should also check any GFI's you might have. My old '94 Bounder was wired so if the bathroom GFI tripped, it would also knock out the refers AC and it would drop back to propane. So check that. But first refer check would be for AC at the refers AC outlet as previously suggested.
My transfer switch was in an overhead cabinet, behind the circuit breaker and 12 volt fuse panels. Over the dinette. A real bear to work on. I did find a factory defect up in there...they used wire nuts that were too small, and eventually road vibration popped them off of pairs of hot and neutral wires and they than shorted to the metal case surrounding the transfer switch. Arcs, sparks, and smoke. Than lights out. Lucky I was up, saw and heard it all.