As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DC ALTERNATOR FAILED DURING GROUND RUN. UPON REMOVAL FOUND THE ALTERNATOR TO HAVE SEIZED. ALTERNATOR WAS SENT TO HARTZELL WITH AN RMA # 13301. PRODUCT WAS REPLACED WITH A NEW ALTERNATOR. NO REPORT WAS PROVIDED TO US ON WHY THE UNIT FAILED, ALTHOUGH WE HAVE ASKED TWICE.