As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LT OPERATIONAL CHECK FOUND L2 EMERGENCY LT BATTERY (M33099) LOW CAPACITY, REF TO HAECO NON-ROUTINE NO.9445962, SPEC NO. B777-33-3-7031. PERFORMED BY TA800 IDT BY TA409,REPLACED L2 EMERGENCY LT BATTERY AND TEST IT "OK" AS PER AMM 33-51-06-960-802 REV 92.