As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER THE ALTERNATOR BELT BROKE FOR THE SECOND TIME IN 8 HOURS, IT WAS NOTICED THAT THE ALTERNATOR PULLEY, ALTHOUGH SMOOTH WHEN TURNED BY HAND, WAS ABLE TO MOVE SIDEWAYS ABOUT AN EIGHT OF AN INCH. WE DID NOT DISSASSEMBLE THE UNIT BUT IT IS SAFE TO ASSUME THE COMUTATOR BEARINGS ARE WORN OUT.