What was found
GREEN HYD RSVR LOW QTY. COMPLIED WITH ECAM AND QRH PROCEDURES. GRAVITY EXTENDED LANDING GEAR WITH SATISFACTORY RESULTS. AFTER PARKING DID EXTERNAL WALKAROUND FOUND NO EVIDENCE OF ANY HYD LEAKS. AFTER CREW DEBRIEF, QTY CAME BACK UP TO BOTTOM OF TOP HAT AFTER LANDING. DUE TO GEAR FREE FALL EXTENSION RESTORED UPLOCK MECHANISMS IAW AMM 32-33-00-02. BROUGHT FLAPS UP AND GEAR DOORS CLOSED. GREEN SYS REQUIRED APPROX 1 GAL SERVICE TO MIDDLE OF TOP HAT. RAN FLIGHT CONTROLS WITH BOTH ELECTRIC PUMPS AND ENGING PUMPS, NO FLUID LOSS IN ANY SYSTEM. INSPECTED CONTROL PANEL TO GREEN SYS FLUID QTY TRANSMITTER, NO DEFECTS. HYD PRESSURE APPLIED, INSPECTION OF THE RT INNER PYLON AREA DISCOVERED PRESSURE SWITCH O- RING BLOWN. REMOVED PRESSURE SWITCH AND CONFIRMED SEAL WAS DAMAGED. REPLACED O-RING AND REINSTALLED PRESSURE SWITCH. REF 29-12-62-04 LEAK AND OPS CHECKED GOOD. R & R GREEN SYS RESEVOIR HYD QTY TRANSNSMITTER FOR PRECAUTION REF 29-31-11-04. OPS CHECKED REF 29-31-00-05, NO DEFECTS NOTED, ACFT OK TO CONTINUE .