As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATOR NOTICED VIBRATION ON ENGINE. STARTER/GENERATOR WAS REMOVED AND INSPECTED. THERE WAS ENOUGH SIDE MOVEMENT OF ARMATURE THAT THE FAN BLADES RUBBED INSIDE OF COVER. DISASSEMBLED UNIT AND FOUND BOTH BEARINGS HAD FAILED. DISASSEMBLED END BEARING AND FOUND BALL RETAINER RIVETS HAD SHEARED AND ALLOWED BALLS TO MOVE RANDOMLY ALLOWING ARMATURE TO MOVE OFF CENTER.