As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PREVIOUSLY INSTALLED OVERHAULED ALTERNATOR FAILED AFTER APPROXIMATELY 27 HOURS OF OPERATION. THE ALTERNATOR WAS MANUFACTURED BY KELLY AEROSPACE/ELECTROSYSTEMS. THERE WAS EXCESSIVE BINDING OF THE ALTERNATOR SHAFT AND PULLEY. IN ADDITION, TWO EACH OF THE COOLING FINS BROKE OFF THE ALTERNATOR.