What was found
AIRCRAFT IN BASE MAINTENANCE: INOPERATIVE EPSU-EMERGENCY POWER SUPPLY UNIT 10WL, 11WL, 12WL AND 13WL (4EA) IN PASSENGER CABIN. REPLACED EPSU-EMERGENCY POWER SUPPLY UNIT 10WL (AALA202406107632), 11WL (AALA202406104080), 12WL AND 13WL (AALA202406106119) (4EA) IN PASSENGER CABIN.