Gil., no I don't have the diagrams, if you could look up the board I would sure appreciate it. I understand about the light switching and have had properly working light in the past. As to the Prevost light in in the fwd panel, my CB #52 is labled to control the bay lights, when opened that CB turns off the Prevost light as well as the bay[if they were working.] I checked the mother board fuses and breakers and all seem OK.