What was found
DURING CRUISE FLT AT FL 300, GREEN HYD QTY DROPPED TO CUTOFF LEVEL. ECAM CONFIRMED GREEN HYD RESVR LEVEL LOW. COMPLIED WITH ECAM AND QRH. EMERGENCY EXTENDED THE LANDING GEAR . UNEVENTFUL LANDING. CHECKED GREEN RESERVOIR QUANTITY, 6 GALLONS READING ON RESERVOIR. TURNED ELECTRIC PUMPS ON BLUE GREEN AND YELLOW WOULD NOT GO ABOVE 1150 PSI, CHECKED THE CIRCUIT BREAKERS IN THE E & E BAY, NO BREAKERS OUT. GREEN SYSTEM HAS AIR PRESSURE LOW LIGHT. RAN APU GREEN SYSTEM, AIR LOW LIGHT WENT OUT. SHUT DOWN APU AIR AND GREEN SYSTEM AIR LIGHT RETURNED. RAN THE NR 1 ENGINE, FOUND ACTIVE LEAK FROM THE ENGINE HYDRAULIC PUMP DEPRESSURIZATION VALVE. RAN BOTH ENGINES AND VERIFIED DISCREPANCY DURING ENGINE RUN. GROUND AMT NOTICE FLUID LEAKING, SHUTDOWN THE ENGINE AND OPEN COWLING TO FIND A LEAK COMIMG FROM ELECTRIC DEPRESSURIZATION VALVE. ENGINE RUN WAS NORMAL IAW JRH. REMOVED AND REPLACED THE LEFT ENGINE ELECTRIC DEPRESSURIZATION VALVE. LEAK AND OPS CHECKED GOOD IAW MM 29-11-32-04-2.