328i Belt Tensioner Defect?
Had my car (2007 328i) serviced recently at a local independent BMW shop. The tech told me that my serpentine belt was slipping off due to a defective belt tensioner - the belt has about 1-2mm hanging over edge of top pulley. The tech says the belt tensioner pulley frame is bending and that this was a known defect but BMW won't recognize it. Only recourse is to replace the entire belt tensioner pulley and frame assembly.
I have searched and haven't found this discussed by anyone else. Is this really a known issue with these cars? Or is he maybe playing some kind of repair shop game here?