Problem Solved!!
As it turns out, I did in fact have a faulty check valve and a leaking passenger door actuator. I replaced both, and everything works beautifuly, I couldn't have done it without fellow posters. Thanks for your time, this board rocks!!
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2012 550CLS
1982 380SL
1985 300D
1998 ML-320
1997 E-320
1984 380SE
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