As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - CREW REPORTED IMMEDIATELY AT ROTATION BATTERY DISCHARGE LIGHT STARTED FLASHING, TEMPORARY LOSS OF SOME INSTRUMENT LIGHTING, AND SEVERAL AMBER EICAS MESSAGES. EMERGENCY DECLARED FLIGHT RETURNED LAX LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND FAULTY A AND C PHASE TERMINALS OF BUS TIE RELAY C902. REPLACED TERMINALS. SYSTEM GROUND CHECK NORMAL OPERATION.