I'm new to Mercedes, but my Volvo also has a light that indicates a burned out bulb. Apparently these indicators compare the resistance of each bulb in the circuit and then illuminate if the resistance is found different. The solution (usually) is to replace the burned out bulb with one of the same manufacture as the corresponding "good" bulb. Though this dosen't always work. Clean terminals are important as this can cause the resistance to vary.
Mark
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