2007 DTS, when drivers door opened the courtesy light does not come on, when shutting down after ignition is off the radio keeps playing along with the button lights even after drivers door is opened. After ten minutes all that stuff shuts off. Reading threads it seems like a drivers door module or switch mechanism (are they the same thing?) I was going to remove the door panel and inspect, clean possibly lube any switch/latch mechanism which are accessible. Luckily I have a hard fail so if I can temporarily fix it I should be able to confirm the bad part.