What is the replacement method for light bulbs that are behind the vent wheels ? There are 4 vent wheel controls. My Left-Center and Far-Left do not burn when lights are on. Both the R side wheel still illuminate.
These 4 vent control wheels are located in a wood trim piece, but the bulbs may actually be located elsewhere.

Please post info for correct replacement, I don't want to scratch or break anything. A repair CD from Mercedes sure would be nice. Does anyone know if one will (or is) available.

DanielW