As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFER NR L/P 9469437 - SPEC NO. B777-33-3-7030 - DURING EMER LT BATTERY CAPACITY TEST FOUND DR 1L FWD BATTERY M33093 LOW VOLTAGE EMER PWR PACK ON DR 1L FWD M33093 REPLACED NWE BATTERY INSTALLAT ION TEST CARRIED OUT FOUND NORMAL REF AMM 33-51-06-960-802 REV.8 4 ADD EMP:V903182 IDT BY TA646