I have an '05 Fleetwood, that had the same issue. I had to call a mobile RV service guy, who showed me a blown 20 amp fuse, which was located in the left rear storage/electrical compartment, with the power cord other electrical boxes. In fact, the fuses for all three of my slides are there. Cost me $80 for him to come out and replace the fuse. However, he did give me a spare 20 amp fuse.
Roland & Jerri, with Maggie & Mollie, our Pups; '05 Fleetwood Providence, 39' DP; '08 Saturn. "The difference between genius and stupidity is genius has it's limits" (Einstein)