We have the orange bulb failure lamp lit in the dash panel on our 1988 300TE.
The warning lamp comes on as soon as the lamp switch is rotated to the 1st position.
All lamps work.
I have replaced all of the front and rear side marker lamps.
The licence plate lamps are lit, but I have not replaced them yet.
Is there another bulb I have missed?

Any other ideas or experiences with this issue?

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2009 Mercedes ML320 Bluetec