120 not working on some outlets

Well after a little lay off... I have one line the gfci line indoors and one outlet (the refrig is plugged into) that still does not work. No power is getting to any of those outlets.. The gfci outlet is not the problem as it is getting no power either. We replaced with regular out too... All the circuit breakers are ok. I talked to Newmar Corp and of course they have no info on my 24 year old Kountry Star. In the basement as they called it I have a transfer switch and a box called a Power Switch which is a converter or Inverter. They said possibly I have a line popped somewhere in either one (the converter or inverter). I dont see a third box anywhere near the 2 I mentioned. I do have a problem with a wood rat getting in the ceiling of the motor home and I can see that some on the wires are frayed. But very limited what I can see. Any other suggestions what I can do? I did have a rv doctor come and check it out. He did check for power from my circuit breaker and transfer switch and the converter or inverted. Maybe I could run other 120 wire but not sure where I would run it too. Circuit breaker to where? Or if that would be a good idea.