Heard the dinging from my dash this Saturday and noticed that I have a "Lamp out" warning light. Man, that' thing's obnoxious! I got out and checked all around the truck but couldn't see any burned out lights. I got the warning in the middle of the day, when I wasn't using any switched lights. Anyone know how to track down which light is out, or does this require a $100 trip to the dealer, with a hook-up to the computer?