Then I'm pretty much out of guesses. I'd still get under it and make sure everything's tight yourself, and let another dealer take a look at it. There's only so many things it could be, and you've replaced most of the components already.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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