What was found
DURING PS-1 CHECK, FOUND LEFT AND RIGHT EXTERIOR OVER THE WING EMERGENCY LIGHTS OUT.-C/A-CHANGED #4 EMERGENCY BATTERY IAW AMM TASK 33-50-04 DID NOT FIX ISSUE. OVER WING LH AND RH EMERGENCY LIGHTS DEFERRED PER MEL 33-29 AUTH 120313D-C. EMERGENCY LIGHTING BATTERY P/N 2013-1A S/N 96144 . REMOVED AND REPLACED EMERGENCY LIGHTS BETTERY POWER SUPPLY #4 IAW E145 AMM 33-50-04. OPS CHECK GOOD. REMOVED AND REPLACED EMERGENCY LIGHTS BATTERY #4 IAW E145 AMM 33-50-04. OPS CHECK GOOD. CHARGER ASSY BATTERY P/N BA5-0933-901 S/N C01280