What was found
PILOT REPORTED HYD G RSVR LOW LEVEL ECAM MESSAGE. FOLLOWED THE QRH, TURNED OFF THE PTU, ENGINE NR 1 HYRDRAULIC PUMP AND PERFORM A MLG GRAVITY EXTENSION. THE ACFT LANDED WITHOUT INCIDENT. DURING TROUBLESHOOTING, HYD PRESS LINE WAS FOUND TO BE LOOSE. TORQUED LEAK CHECK OK. NO DPI POPPED, BUT AS A PRECAUTIONARY R+R #1 ENG CASE DRAIN FILTER AND HP+LP FILTER IN THE GREEN SYS PER AMM 29-11-43/44 SVC HYD SYS 12-12-00. PERFORMED ENGINE RUN. OPS CHECK AND LEAK CHECK PASSED. PERFORMED TASK 32-00-00-860-003-A TO PUT LANDING GEAR SYS BACK TO NORMAL MODE AFTER A FREE-FALL EXTENSION. A/C OK FOR SERVICE.