What was found
DURING TRANSIT CHECK, THE HYDRAULIC SYSTEM B WAS SHOWED WITH QUANTITY OF CERO. MAINTENANCE PERSONNEL PERFORMED REVISION DETECTING LINE TUBE HYDRAULIC SYSTEM B MAIN BAY MLG RIGHT SIDE REAR LEAKAGE; SO THE REFILL HYDRAULIC RESERVOIR A AND B STANDBY SYSTEM WAS ADDED AND THE LINE TUBE HYDRAULIC SYSTEM B MAIN BAY MLG RIGHT SIDE REAR WALL P/N 272A4453-1019, S/S, MANUFACTURER BOEING COMPANY WAS REPLACED IAW AMM 20-10-52-300-803 AND AMM 29-11-12 AND THE HYDRAULIC SYSTEM B OPERATIONAL TEST WAS PERFORMED IAW AMM 29-11-29, TESTED CORRECT.