All I can say is that is one sorry shop if they expect you to pay for the repair a second time. I would pursue this further with the owner of that establishment. A good shop stands behind the work they do.

Brian

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Mercedes Benz Master Tech
ASE Master Technician
Diagnostic Technician
Owner of "Behind the Star Inc."
Raleigh NC.
www.behindthestar.com
brian@behindthestar.com