I have cleaned a couple and it was fixed for a while..but the problem did come back on one of them. I then cut a small black poece of hose and slid it over the pin. Fixxed!!!

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM