As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT ZONE SEAT EMERGENCY LIGHTS INOPERATION REF HAECO NON-ROUTINE NO.9491473,ORIGINATED BY EMP V905356,SPEC NO.B777-25-3-7250. PERFORMED BY EMP V905356,REPLACED THE M33401 BATTERY AND INSTALL ATION TEST FOUND RESULT "NORMAL" REF AMM 33-51-06-960-803 REV95, IDT BY TA407.