As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, HYDRAULIC FLUID QUANTITY DROPPED TO THE STANDPIPE LEVEL AND THE HYDRAULIC PRESSURE DECREASED AFTER THE LANDING GEAR WAS EXTENDED. REPLACED DEFECTIVE O-RING SEAL ON THE NR 3 ENGINE DRIVEN HYDRAULIC PUMP PRESSURE FITTING. OPERATED HYDRAULIC SYSTEM AND NO LEAKS WERE NOTED.