When we had our 2007 Jayco Eaqle 322FKS we had an electrical problem the 2nd year. I finally found it in the electrical panel. Seems that after a few thousands miles of travel some of the wires in the panel had loosened up and was arcing. This caused a build up of resistance on the connections. Plus I found some of the wire insulation has melted off the A.C. wiring. I then cleaned up the terminals- reconnected the clean wires and tightened everything down.
That was the fix....
Hope yours is that easy.
Happy trails,