Hi
I think that MB must have sent a notice to MB Dealers advising them not to work on CF's.
I have taken both of my CF's to the same MB Dealer since 2005. Then I attempted to make an appointment and was told the garage would no longer work on it. Then they called back and said, that since I had been such a loyal customer they would make an exception. In the meantime I took it to a Chrysler garage and they happily accepted my money.
Regards
MP