What was found
WHEN MOVING THE EMERGENCY LIGHT SWITCH TO ON NO EMERGENCY LIGHTS COME ON. WHEN SETTING THE SWITCH TO ARM ALL LIGHTS COME ON EXCEPT THE AFT BULKHEAD EXIT SIGN AND THE LOWER EXIT SIGN IN THE LAV. THIS WAS AFTER AN ALMOST 3 HOUR FLIGHT.LABOR PERFORMED EMER LIGHT OPERATIONAL OIECK AND NOTED #3 EMER BATTERY FAILED CHECK. NJA MCC REQUESTED THAT #1 AND #4 BATTERIES ALSO BE REPLACED. REMOVED EMER BATTERY #1 PER NJA MCC REQUEST. REMOVED. INSTALLED CUSTOMER SUPPLIED NEW BATTERY. REMOVED EMER BATTERY #3 DUE TO FAIL OP OIEO<. REMOVED P/N: CBS28-1. S/N: 2343M. INSTALLED CUSTOMER SUPPLIED NEW BATTERY. REMOVED EMER BATTERY #4 PER NJA MCC REQUEST. REMOVED. INSTALLED CUSTOMER SUPPLIED NEW BATTERY. OPERATIONAL CHECKS PERFORMED WITH NO DEFECTS NOTED AT THIS TIME. WORK PERFORMED WITH REF TO THE MODEL AMM 33-50-06 AND 33-50-00.