As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE LOW VOLTAGE ILLUMINATED. DURING INSPECTION ON THE GROUND, A BROKEN ALTERNATOR BELT WAS DISCOVERED. THE BELT APPEARED TO HAVE UNRAVELED FROM THE TOP DOWN. THE ALTERNATOR HAD BEEN REPLACED 14 HOURS EARLIER, THE PULLEYS WERE CHECKED FOR PROPER ALIGNMENT. SUBMITTER SUGGESTS FROM ALL INDICATIONS THE BELT WAS DEFECTIVE.