What was found
BFL - FLT 3130 - FOUR ADJACENT FLOOR EMERGENCY LIGHT FAILED TO TEST. MAINTENANCE REMOVED AND REPLACED BATTERY PACKS AT 20LN, 21LN, 22LN, AND 23LN, (S/N 18435, 18173, 17498, 19527). OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)