As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTED LEFT ALTERNATOR INOPERATIVE LIGHT ON IN ACFT DISCREPANCY LOG. MECHANICAL INSPECTION OF THE ALTERNATOR REVEALED THAT THE LOWER BRUSH LEAD CARRIAGE HELD IN PLACE BY A TERMINAL STUD AND NUT, HAD ROTATED FROM ITS ASSY POSITION TO A POSITION IN WHICH THE EXPOSED WIRES AT THE CARRIAGE ATTACHMENT POINTS OF BOTH BRUSH LEADS WERE IN CONTACT WITH EACH OTHER CREATING A GROUNDED CIRCUIT (AS EXPLAINED BY THE DIRECTOR OF WARRANTY AND SUPPORT OF MFG ENGINE TECHNOLOGIES).