When out they complete the circuit. I suspect you have a bad door button switch.I agree. The sockets are hot. Checked wiring and looks good. Pulled apart door buttons and they also look good and work testing on bench. They are intermittent. If I disconnect them the light s will stay on. Reconnect and the lights work for a while then can go back on. Does the door buttons ground when in or out. I looks like they ground when out. Don't understand how a ground is working