What was found
FAS REPORT EMERGENCY EXIT LIGHTS CAME ON DURING PREVIOUS TAKEOFF FOR 5 MINUTES MUST TROUBLESHOOT. LOCKING DUE TO HISTORY F/A AT AFT GALLEY STATES EMERGENCY EXIT SIGNS AND PATH LIGHTING WAS OBSERVED FROM OVERWING EXITS ALL THE WAY TO AFT OF A/C. F/AS AT FWD GALLEY DID NOT SEE EMERGENCY LIGHTS GOING OFF ON FWD CABIN. INITIAL EVAL COULD NOT DUPLICATE DISCREPANCY FOUND EMERGENCY LIGHTS OPERATING NORMAL PER FIM 33-50 TASK 801. TOMC REQUESTING TECH SUPPORT TO HELP ON THE T/S DUE TO HISTORY. REPLACED AFT EMER LIGHT SWITCH PANEL PER TECH SUPPORT, REPLACED MODULE LIGHT ASSEMBLY M1886 REF AIPC 33-29-51-01. ON REMOVAL FOUND SCREWS NOT SECURING TO BACKPLANE. REF AIPC 31-15-21-03A REPLACED BACKPLANE. PERFORMED OPS TEST OF EMER LIGHT SYS REF AMM 33-51-00. LIGHTS FUNCTION NORMALLY.