As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON OUTBOUND FLIGHT, THE PILOT REPORTED LOSS OF THE COMBINED HYD PRESSURE AND FLUID; AUXILIARY PUMP TEMPORARILY FAILED, TOO. PILOT MADE UNSCHEDULED LANDING. ON GROUND, THE NR 1 ENGINE DRIVEN PUMP, FOUND WITH BLOWN-OUT GASKET CAUSING HYD LOSS AND DAMAGE TO THE PUMP. PUMP WAS REPLACED WITH AN O/H UNIT; REPLACED THE MAIN PRESSURE, BYPASS AND RETURN FILTERS; SERVICED WITH FLUID. PERFORMED HYD POWER SYS OPS CHECK AND FOUND SATISFACTORY.