As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROOT CAUSE: LIGHT FLICKERED DURING CRUISE. LEFT GEN DRIVE. REMOVED AND REPLACED BPCU PER MM 24-41-03 DUE TO FAULT MESSAGE "REPLACE BPCU", SERVICED LT IDG PER MM 12-13-01. VERIFIED WIRING FROM D10964 TO 4216P FOR OBVIOUS DEFECTS, VISUALLY CHECKS OK. LT GEN CHECKS GOOD ON ENGINE RUN.