As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND CABIN L4 DOOR AREA EMERGENCY POWER SUPPLY M33407 BATTERY LOW CAPACITY, REFER TO HAECO NR NO. 9464551, SPEC NO. B777-33-3- 7019. PERFORMED BY EMP V903250 IDT BY TA308, REPLACED THE CABIN L4 DOOR AREA EMERGENCY POWER SUPPLY M33407 BATTERY AND OPERATIONAL TEST CARRIED OUT, FOUND NORMAL AS PER AMM 33-51-06-960-802 REV99 & AMM 33-51-00-710-801 REV 99.