As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER PUSH BACK, ENGINE START FDE MSG "ELEC GENERATOR CONTROL UNIT L2". WITH MOC ADVISE PILOTS TRIED 2 GENERATOR RESET. ACFT RETURNED TO GATE. OVERVOLTAGE TRANSIENT PROTECTION UNIT INSTALLED IAW B787-A-24-09-08-00A-720A-A. ENGINE RUN CARRIED OUT WITH NO FAULT. OPS SERV OTPU VISUAL INSPECTION CARRIED OUT WITH NO FAULTS.