As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THERE ARE 3 CAP SCREWS HOLDING THE 2 HALVES OF THE ALTERNATOR HOUSING TOGETHER. WHEN THE ALTERNATOR FAILED IT WAS DISCOVERED THAT 1 CAP SCREW WAS MISSING AND THE OTHER 2 HAD PULLED OUT OF THE THREADS IN THE HSG. THE ALTERNATOR HOUSING SEPARATED ALLOWING THE ROTOR TO CONTACT THE STATOR. LOCK WIRE AND LOCKING TABS ON THE CAP SCREWS WERE NOT DAMAGED AND SECURE. ALTERNATOR REPLACED.