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I'm really sorry to see your car in such a state! I also have a '14 M7, but have had no trouble with it whatsoever. From your post it sounds to me like the dealer's service department is guessing as much as anything, and haven't put sufficient effort into determining the exact cause of the problem. In your situation I too would be uncertain of the reliability after the "repair". I suggest contacting GM directly with your problem, and state your concerns and case. Toward the back of the owner's manual there is a process described and information regarding such contact.
And as far as I can tell, your issue is a fluke rather than the norm. I have nearly 37K miles on my Z51 and its running just as it did when new. Good luckand I hope your car is correctly fixed soon!
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'74 Stingray coupe, heavily modified, as seen in August 2011 VETTE magazine, 2014 Stingray Z51 #196, ordered 02/11/13, built 08/29/13, Museum Delivery 10/04/13, driven daily!
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