I have a Fleetwood Tioga Ranger, which is a Class C, but I had slide problems several years ago, and it took the dealer service people three hours to find the fuses!!!!! (The service manager was kind enough to charge me for only one hour.)
And, they were not with the other motorhome fuses on the panel next to my bed. They were hidden in my under-bed storage area in the same compartment (made of thin wood panels screwed together) where my rear furnace and converter are located. Hiding things like fuses are part of the challenge of being an RV manufacturer!
So, try lifting your rear bed up, assuming there is a storage area under it, and look for your fuse panel there. The fuses for the slides might be in a separate panel from the others, but nearby in a wooden box!!
Anyway, good luck! I need to get a wide marker so I can write a message on the box for whoever I eventually sell my motorhome to so they do not have to wait for three hours for the mechanics to trace the wires!!!