Three bolts hold the regulator in place. The part in question has failed for the most part, so you can't just set it right and go on your merry way!

Fortunately, FastLane has the part for about $2...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car