As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
{B777-33-3-7019} EMERGENCY LIGHTING BATTERY PACK (M33405) FOUND CAPACITY CHECK FAIL. TRANSFER REF.NON-ROUTINE HX NRC WO.3022357 AND ORIGINATED BY EMP. EMERGENCY LT BATTERY PACK (M33405) REPLACED AND INSTALLATION TEST CARRIED OUT WITH NORMAL RESULT AS PER AMM 33-51-06.