What was found
EMERGENCY LIGHTING: EMER LIGHTS DO NOT ILLUMINATE WHEN POWER IS OFF AND SWITCH IS IN ON POSITION. ARM POSITION FUNCTIONS CORRECTLY. CORRECTIVE ACTION: EMERGENCY LIGHT DID NOTILLUMINATE WHEN POWER WAS OFF AND SWITCH WAS TURNED ON. SWAPPED EMERGENCY BATTERY PACK#3 WITH EMERGENCY BATTERY PACK #4 AND FOUND THAT THE #4 BATTERY PACK WAS FAULTY. BATTERY PACK SWAPED BACK TO THEIR ORIG!NIAL POSITONS. REMOVED AND REPLACED #4 AFT EMERGENCY BATTERY PACK IAW AMM CE-700 AMM 33-50-05. OPS CHECK GOOD. DATE OF MANUFACTURE DEC 11 2024.