I had mine replaced with a PPG aftermarket unit and have had no problems with it. MUCH less expensive than "official" MB, despite the fact that PPG is an OE manufacturer, I'm told.

I did just what Neil said to do -- called the dealer and asked who they used, then called this installer myself. He came and did it in my driveway, which is handy so you can leave it alone for the requisite 24 hours.

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Steve
'93 400E