What was found
RETURNED, ACFT WAS GNDED, DURING CLIMB THE FLIGHT CREW GOT AN ECAM MSG, HYD G RSVR LOW LVL, & TURNED OFF ENG 1 HYD PUMP PB IAW ECAM PROCEDURE. THE CREW DECLARED AN EMER & RETURNED WHERE THE ACFT LANDED SAFELY & WAS TOWED BACK TO THE GATE, DUE TO NO NOSE WHEEL STEERING. FOUND THE RT MLG DOOR BYPASS VLV LEAKING & REPLACED IT IAW AMM 32-00-00-860-003-A. SATISFACTORY OPERATIONAL CHECKS WERE ACCOMPLISHED IAW AMM 29-00-00-280-006.