I think on most models there are two 120V plugs behind the RR in the slide. One is dedicated I think to the RR and the other is shared with the microwave/conv oven circuit. Ya wanna be on the RR dedicated circuit I'm thinkin. If you have a coach that the RR was installed after-market with a separate inverter then this might not be the case maybe.
In either situation, there is a pressed electrical wiring connector in the basement bay I think behind where the PVC tube goes through under the slide. This connector could have come loose?
If yer good at the breaker panel, and not at the RR outlet then I'd check the connector between them probably first choice.
I do not think that the RR is on a GFI circuit, at least not on my model coach. YMMV
Jay and Joyce.. and IZZY the Havanese guard dog
2009 Tiffin 42 QBH on Spartan, HydraLift, DualSport mosickle, Jeep Cherokee TrailHawk toad, AF1 brake system