As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CRUISE FLIGHT, THE RT ALTERNATOR FAIL LIGHT CAME ON. AFTER LANDING THE ALTERNATOR WAS REMOVED.THE ALTERNATOR DRIVE GEAR FAILED CAUSING THE DRIVE GEAR TO SLIP AND NOT TURN THE ALTERNATOR. THE RUBBER SURROUNDING THE GEAR WAS HALF GONE. THE DRIVE GEAR WAS REPLACED.