As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WOODRUFF KEY ON THE ALTERNATOR SHAFT SHEARED LEAVING THE CLUTCH FREE SPOOLING, FREE SPOOLING ON THE ALTERNATOR SHAFT DAMAGING THE ALTERNATOR RING GEAR PN 632018. ALTERNATOR CLUTCH RETAINING NUT AND COTTER PIN REMAINED STILLIN PLACE ON THE SHAFT. THE KEYWAY IN THE ALTERNATOR SHAFT APPEARS TO BE CUT TOO DEEP NOT ALLOWING THE WOODRUFF KEY TO ENGAGE IN THE CLUTCH PROPERLY.