I think I've won the battle - after replacing both license plate lamps - no more warning on the display!

The rear seat overhead lamp was also burned out...as was the glovebox lamp.

Cheers,

Matt

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'99 W210/OM606.962 - bone stock for now.
'94 Dodge/Cummins - NV5600, P7100, ~400hp
'96 Jeep ZJ - Cummins ISB 170/Allison LCT-1000 conversion project basket case
'00 VW Jedi - 345k, bone stock