Originally Posted by Ronman
I've had a bulb out for a long time. I finally took it in and it turns out the board is bad, not the bulb. So they had to order me a cluster. Apparently it was not that easy of a job, the technician apparently hurt his elbow in the process. Good luck.
The exact same thing happened with my Merc a few years ago. Bulb went out in the instrument cluster; and according to the dealer, the entire internal board had to be replaced. It took a good part of a day and was rather expensive. MB's quality ranking has been sliding for years, and reports suggest that much of that decline is due to poor electrical systems. This dash lamp problem may be another example of those disturbing quality issues.