What was found
LOST ALL FLUID ON HYDRAULIC NR 2 SYS, RUDDER STANDBY POWER OFF LIGHT ILLUMINATED. DUMPED FUEL AND LANDED AT AIRPORT. PERFORMED HYDRAULIC SYSTEM NR 2 LEAKAGE FAULT ISOLATION AND TRACED PROBLEM AT NON-REV SHUTOFF VALVE. REMOVED AND REPLACED DEFECTIVE O-RING, FILL UP HYDRAULIC SYSTEM TO PROPER LEVEL AND RETURN TO NORMAL. NR 2 SYSTEM EDP HYDRAULIC DID NOT WORK LONGER W/O FLUID, REMOVED AND REPLACED SYSTEM NR 2 HYDRAULIC MANIFOLD FILTERS IAW MM. VISUALLY CHECKED EDP CDASE FILTER, FOUND OK TO SERVICE. PERFORMED DEEP LEAK CHECKS. RUN HYDRAULIC ELECT PUMP AND MOTORIZED NR 2 ENG MOVE FLT SURFACES AND NO LEAKS NOTED. ACFT OK TO SERVICE.