As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON FIRST START OF THE DAY A LOUD SQUEALING NOISE WAS HEARD ALONG WITH WHITE SMOKE EXITING THE COWL FLAPS AND THE PILOT SHUT DOWN ENGINE. UPON REMOVING THE COWLING IT BECAME OBVIOUS THAT THE ALTERNATOR HAD SEIZED AND THAT THE BELT WAS BADLY BURNED. LATER EXAMINATION BY THE MECHANIC REVEALED THAT A DIODE BLOCK SCREW HAD VIBRATED LOOSE AND WEDGED BETWEEN THE ROTOR AND STATOR AFTER SHUT DOWN FROM THE PREVIOUS DAYS FLIGHT.