What was found
CAPT REPORTED LT HYD SYSTEM LOST, LT HYD QTY AT EICAS FAULT CODE 291106-01, LT HYD ELECTRIC PUMP FAULT CODE 291133-01, PTU FAULT CODE 292201-00 AND RT ELECTRIC PUMP OVERHEAT AT EICAS FAULT CODE 291113-02; THEREFORE LANDING GEAR WAS OPERATED IN ALTERNATE MODE. WHEN A/C WAS IN RUNWAY, IT WAS TOWED TO PLATFORM BY TOWING TRUCK DUE TO THE STEERING WAS OUT OF SERVICE. DURING MX REVISION, A LEAK WAS DETECTED ON LANDING ACTUATION HYD LINE AND THE HYD TANK WAS EMPTY. THE HYD LINE WAS REPLACED IAW MM 32-00-00, TESTED CORRECT. DURING OVERNIGHT SERVICE, LOW LT HYD QTY AND HYD LEAK ON PTU WERE DETECTED. PTU WAS REPLACED IAW MM 29-22-01, TESTED CORRECT.