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Hi my name is Robert...
I see no other experts have responded. To start make sure the parking brake is set and the engine is in park or neutral, next start the engine and try to run the rooms, the slideouts should use the chassis battery for operation. Next I would go to the chassis battery and follow the cables and look for a blown fuse OR tripped breaker, sometimes they will use one on the cable from the sliderooms to the battery, below is a picture, most have a small tab on them that pops out when they trip, check near the battery and inside any fuses boxes that you have. IF you have more questions or concerns please feel free to contact me.... Robert