As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPLACE THE EMERGENCY LIGHT POWER SUPPLY BATTERY PACK ON M33409 REF NON-ROUTINE NR 9483397 -, SPEC NR B777-33-3-7019. REPLACED THE BATTERY PACK ON POWER SUPPLY M33409 & POWER SUPPLY BATTERY PACK CAPACITY CHK FOUND ''NORMAL'' AS PER AMM 33-51-06-960 -802 REV.86 & AMM 33-51-06-200-801 REV.86.