As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NUMBER ONE ENGINE HYDRAULIC PUMP FAILED. CREW FELT VIBRATION IN CABIN WITH 'A' HYDRAULIC SYSTEM PRESSURE FLUCTUATING AND THEN VIBRATION AND FLUCTUATION STOPPED, BUT THE PUMP LOW PRESSURE LIGHT CAME ON. *S/D* REPLACED THE NUMBER ONE ENGINE DRIVEN HYDRAULIC PUMP.