First check that the lights that are not working are not burnt out.Replace with light that you know are good. Then check fuses, if ok then go under slide and look for anything that might be crushed or broken. That is what I would do.
2011 jayco 33rlds, 2002 Ford excursion, v-10, 3:73 gears 4x4 mine. 2008 Suzuki sx-4, hers. Retired Air Force, now Retired.