What was found
AT CRUISE FL320 GREEN SYS LO PRESS CAUTION WITH HYD FLUID AT RED DOT ON OVERHEAD PANEL AND IN AMBER RANGE ON ECAM (50 PSI). COMPLIED WITH ECAM AND QRH PROCEDURE, MANUAL EXTENDED GEAR AND EMERGENCY DECLARED. ECAM MESSAGES KEPT CYCLING CONSTANTLY AS IF PROCEDURE STEPS HAD NOT BEEN ACCOMPLISHED. AMM: 29-11-62-04 BEFORE MOVING A/C, VERIFIED RESERVOIR MOUNTED QTY GAUGE SHOWED GREEN RESERVOIR TO BE WITHIN SERVICE LIMITS. AFTER ARRIVAL AT GATE, HAD HYD FLUID DRIPPING FROM #1 ENGINE DRAIN MAST (PYLON DRAIN ORIFICE) AND DRAINS AT AFT END OF PYLON. FOUND ENGINE PUMP PRESSURE SWITCH 113GK LEAKING INTO PYLON AREA. REMOVED SWITCH, NEW SWITCH INSTALLED IAW AMM 29-11-62-04. LEAK AND OPS CK GOOD.