Has anyone had experience with problems relating to the overhead lamp unit on their w140 S Class? Neither of my reading light switches operate (I’ve checked the bulbs) and recently only the right side dome light operates. I tried moving the dome bulb from the right side to the left side, but only the right side will operate. I did notice after removing the lamp assembly there is a circuit board that controls various features of the lamp assembly unit.

Do you think I’m experiencing failing circuit board in the lamp assembly or just bad switches?

Russell