I'm having a problem with an INTERMITTENT Defective Bulb indication on the dash display in my 1999 E300 turbodiesel (W210). The car has 66k miles on it since I bought it new in January 1999.

I can drive for a long way with the headlights on with no problem.
However, on a random basis the Defective Bulb notification comes up in the instrument cluster display. Once it indicates Defective Bulb, it stays that way as long as I continue operating the vehicle. If I stop the engine for a brief stop and shut everything down, the problem resets to normal operation when I start the car and turn on the headlights again. This has been going on for a few months. I have checked many times and there are no defective bulbs on the car. The dealer tech checked too with no trouble found.

On Monday this week, the display signaled "Defective Display" and stayed that way. Then I stopped for coffee and shut everything down. After coming out to the car about 5 minutes after shutdown, everything on the display worked fine and I haven't had another "Defective Display" notification come up again after several hundred miles of driving.

Any recommendations on what to do to solve this problem ?

Thanks,

Ken