Insist the Service Manger raises a DQR to MMAL, this is the correct way your service department should be reporting defects that are ongoing or cannot be diagnosed and rectified. Also get a copy of the DQR if you can or at least the reference number. This is essential if you want to take it further. Your car is still under warranty so I see it is your right to have access to this information.
cheers, OJ.
cheers, OJ.
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