What was found
DFW - DURING SCHEDULED PS CHECK MAINTENANCE REPORTED EVERY OTHER EMERGENCY FLOOR LIGHT WAS INOPERATIVE AND ALL OTHERS WERE DIM. MAINTENANCE REMOVED AND REPLACED ALL FOUR POWER SUPPLY UNIT BATTERY PACKS, (S/N''S 1654, 1745, 1382, 1381). OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)