Interior Lights in Rear Shell Not Working

[ahuddles]

I have a 2009 3124KB. The interior lights in the rear shell that are controlled by the button under the bathroom wall have stopped working. I have checked the 20 amp fuse that goes with the rear roof lights, and it seems to be fine. My first thought was that it is a problem with the button under the bathroom wall. When I push it down manually or with the bathroom wall, the rear shell lights still don't work. However, when the button is pushed down, it does still power the CO/LP monitor and the water heater ignition switch, which indicates that the button is still working to some degree. All of the other lights in the camper are working fine.

Any ideas on what the issue might be and how to fix it?