Not sure about the problem, but recently we have been fixing the photosensitive mirrors that go bad in 210 cars with a glue on mirror face we get from a local glass shop. Ten bucks or so. Wish I had known that when I had my E430 with a bad drivers mirror.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician