Craftsman 1/2HP opener. Operates fine, except that the overhead lights just stopped working. I noticed that the unit says 75W max bulbs, but I was using 100W. Did I burn something out? The bulbs are still good. I couldn't find a fuse to replace. When I hit the button, I can hear a click sound, but the lights don't come on. Is there a relay or something to replace? Or do I need to replace the circuit board? If so, how much do they cost? Thanks