The lites under the cabinet above the bed in the Bedroom slide did not work in my MH. It turned out to be a screw mounting the bed frame to the Slide wall had severed the wire.
Was able a) move the bed frame, b) cut a small hole in the wall board below the bed frame, c) snake out the severed wire, d) butt connect the severed wires, e) patch the wall board (not very pretty but it is covered by bed frame), and f) reattached the bed frame.
It has been working since 2007.