Any results? I've a similar problem.
The 3 ceiling lights are not working on my 2007 2514g rockwood.
I suspected the kill switch underneath the kitchenette - it prevents the lights to stay on when folding the tent camper. So I've connected the wires directly, by passing the kill switch and it didn't work either.
The outside door amber light works, as well as the AC, MaxAir and all interior AC plugs.
Also, i've checked the fuses.
I'm now suspecting a corroded wire/connection somewhere along the 12v.