Be sure to check fuse 13 and 14. If they are OK take it back and make them fix it. Get the repair in writing so if you have any further problems, you will have a leg to stand on!
Thanks

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