As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN ANNUAL INSPECTION THE ALTERNATOR WAS FOUND TO BE LOOSE BUT STILL WEDGED IN THE MOUNT, AND THE FAN BLADES RUBBING ON THE ENGINE/ALTERNATOR MOUNT. THE ALTERNATOR MOUNTING BOLT WAS FOUND IN THE LOWER COWLING, THE NUT AND WASHER WERE NOT FOUND. IT IS BELIEVED THAT THE NUT VIBRATED LOOSED DURING OPERATION, ALLOWING THE BOLT TO WORK ITS WAY FREE. THE ALTERNATOR AND THE MOUNT WERE BOTH DAMAGED AND REPLACED.