As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CHANGING OIL DURING ANNUAL INSPECTION, FOUND STEEL AND RED RUBBERY PIECES IN FILTER. REMOVE ALTERNATOR, METAL COMING FROM DRIVING GEAR ON CRANKSHAFT AND ALTERNATOR DRIVEN GEAR. RUBBER COMING FROM ALTERNATOR DRIVE COUPLER. FOUR BOLTS HOLDING CRANKSHAFT GEAR TO CRANK WERE LOOSE ALLOWING GEAR TO SLOP AROUND AND CAUSE WEAR OF GEARS AND COUPLER. LOCKING PLATES THAT SECURE 4 BOLTS WERE MISSING.