As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT DIVERTED DUE TO HYDRAULIC SYSTEM #1 LOW PRESSURE WITH ZERO QUANTITY IN FLIGHT. MAINTENANCE WAS DISPATCHED AND REPLACED THE NR 1 ENGINE DRIVEN PUMP AND ALL HYDRAULIC SYSTEM FILTERS ON THE NR 1 SYSTEM AND SERVICED THE HYDRAULIC SYSTEM.