The odometer light on my E34 540i quit working yesterday. I cranked up and noticed I couldn't read the total miles or the trip miles either one. Turning on the headlights doesn't help, either. Everything else on the dash display still works fine. Is there a light bulb in there that's probably burned out? I can faintly see the numbers if there is a strong light on the dash, but I can't quite make them out.