As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3551 THE CREW REPORTED THEY OBSERVED HYD 1 LO QTY IN FLIGHT. QTY CONTINUED TO DROP IN FLIGHT. DECLARED EMERGENCY AND DIVERTED TO RDU. HYD QTY NEAR "0" UPON LANDING. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. INSPECTED AND FOUND NR 1 HYD PUMP ENGINE TO BE LEAKING REMOVED AND REPLACED E-1 HYD PUMP IAW AMM 29-10-03 AND PERFORM ALL RUNS LEAK CHECKS ALL GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.