It's a dealer problem if you're still under warranty. If not, I can't imagine that the pulley is too expensive. If you're DIYing it, go ahead and replace the belt too. It's a wear item, and you just took some life off of it.
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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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