As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) ALTERNATOR DRIVE BELT STRETCHED AND SLIPPING - INVESTIGATION FOUND THAT THE DRIVE BELT FITTED WAS IN FACT AN AUTOMOTIVE PART (BOSCH 13A0965 FOR FITMENT TO TOYOTA MOTOR VEHICLES) AND NOTAPPROVED FOR FITMENT TO AIRCRAFT - PULLEY PNO 77579 WAS EXCESSIVELY WORN IN THE GROOVE - PERSONNEL/MAINTENANCE ERROR -UNAPPROVED PART