As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATOR WAS REMOVED FROM ENGINE FOR CYLINDER REMOVAL ACCESS. WHILE REMOVED A 500 HOUR INSPECTION WAS INITIATED. THE STATOR WINDINGS WERE DISCOVERED TO BE OVERHEATED AND BLACKENED. ALTERNATOR HAD ACCUMULATED ONLY 241.7 HOURS SINCE LAST 500 HOUR INSPECTION. THIS FACILITY HAS BEEN DOING 500 INSPECTIONS AT 400 HOUR INTERNALS. ALTERNATOR WAS WORKING FINE BEFORE INSPECTION.