As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED THAT THE ELECTRICAL SYS WOULD SHOW A DISCHARGE AND THAT A WHINING SOUND WOULD BE HEARD IN THE HEADSET. UPON FURTHER INVESTIGATION THE MECHANICS NOTED THAT THE BOLTS THAT HOLD THE ALTERNATOR HALVES HAVE COME LOOSE. ALTERNATOR HAS 403.1 HRS ON IT AND THE ACFT FOR JUST OVER 9 MONTHS.