What was found
SHUTDOWN HYDRAULIC SYSTEM DUE STEADY SLOW QTY LOSS, WITH SYSTEM SHUTDOWN QTY LOSS STOPPED. THEN RT GEAR DOOR LIGHT CAME ON WITH A LOUD RUMBLE FROM THE NOSE GEAR DOOR. ELECTED TO RETURN TO EINN, DUMPED FUEL TO MAX LANDING WEIGHT. REPOWERED HYDRAULIC SYSTEM FOR NORMAL LANDING. REPLACED TEE FITTING RT MAIN RESERVOIR AND LEAK CHECKED GOOD. CHECKED AND ADJUSTED UPLOCK RIGGING ON MAIN LANDING GEAR DOORS AND GROUND OPS CHECKED GOOD PER 32-10-00.