As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT AND RT UTILITY BUSES TRIPPED FOR ABOUT 3-4 SECONDS IN FLIGHT. ALSO LT AND RT UTILITY BUS MESSAGE APPEARED ON EICAS. UTILITY BUSES RESET THEMSELVES. GALLEY POWER AND VIDEO TURNED OFF. T/S PER MM 24-22-00, REMOVED AND REPLACED LT AND RT GCU AND BPCU AS PER MM 24-22-02 AND 24-41-03. PERFORMED INSTALLATION TEST AND AC POWER SYSTEM OPERATIONAL TEST AS PER 24-22-00. ALL TESTS SATISFACTORY, OK TO CONTINUE.