What was found
G RSVR LO LVL DISPLAYED ON UPPER ECAM SCREEN. - HYD AT "0" FOR THE DURATION OF TOW TO GATE. YELLOW AND BLUE SYSTEM QTYS ARE NORMAL. PILOT REPORTED APPROX 1 HOUR BEFORE SCHEDULED LANDING THEY ENCOUNTERED SOME TURBULENCE. MOMENTS LATER THE HYD G AIR PR MESSAGE APPEARED FOLLOWED BY THE HYD G RSVR LO LVL. PILOT THEN FOLLOWED PROCEDURES, GREEN SYSTEM WENT TO "0" QTY .LEAKING LINE SECTION LEFT HAND WING SUPPLY WITH HOLE WORN THROUGH LINE BETWEEN LEFT WING RIB 1 ANS RIB 2. MANUFACTURED NEW LINE SECTION REF GPM 1-0-13-6. RYNGLOKED NEW LINE SECTION IN PLACE REF GPM 1-0-13-28. NEW LINE SECTION (MARKED WITH TAPE STREAMER) NEEDS LEAK CK RAN ENGINE SUPPLING GREEN PRESSURE AND CYCLED FLIGHT CONTROLS NO LEAKS NOTED.