Funny (to us) story.  The lights in our basement didn't work, or so we thought.  We looked for fuses and replaced bulbs.  Still no lights so we made a point not to need anything after dark.  This went on for more than six months before we mentioned it to someone.  They said "Is your master switch turned on?"  We said "What master switch?"  Come to find out, the switch on our dash board that was labeled Luggage Lights was in the Off position.  Once we toggled it to the On  position, we had basement lights!  Do you possibly also have a master switch for the basement lights that is turned off?  We had no idea we had a master light switch or that Luggage Lights meant basement lights.  We also now have spare bulbs.

I had to contact Fleetwood.  The rep was very helpful and sent me the schematic for a fuse box I didn't know existed.  Unfortunately the schematic didn't match, but it was the right fuse box.  I pulled every fuse until I found the one that was blown.  This happened just before we pulled out for a three week trip so we were happy.  Just returned safely. (BTW, I don't have a master switch on the dash)