As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LT ALTERNATOR LIGHT FLICKERED DURING TURBULENCE. LIGHT CAME ON STEADY ON THE WAY TO MAINTENANCE. REMOVED ALTERNATOR, HEARD SOMETHING RATTLING INSIDE. REMOVED COOLING SHROUD AND FOUND ONE BRUSH INSIDE. REMOVED BRUSH BLOCK AND FOUND A PIECE OF IT AROUND THE BRUSH HAD BROKEN AWAY. REPLACED ALTERNATOR WITH O/H UNIT, OPS CK NORMAL.