As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT LOST ALL ELECTRICAL POWER. ON INSPECTION, THE ALTERNATOR FAN WAS FOUND DESTROYED AND LODGED IN THE ALTERNATOR BRACKET AND ENGINE BAFFELS. SUBMITTER STATED POSSIBLE CAUSE SEEMS TO BE FRAME CRACKS OR DAMAGE DONE PREVIOUSLY TO CAUSE A FAN SEPARATION UNDER ROTATIONAL FORCE. SUBMITTER RECOMMENDED CHECKING THE FAN EVERY 100 HOURS OR EVERY ANNUAL. FOR CRACKS OR DEFECTS OR AS IN AD 72-15-02.