The biggest and best bit of advise I can give here is to go to an experienced MB only tech. These can be hard if you don't know them...but if you do they are pie!
Good luck.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM