As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2974, DURING CLIMB THE CREW REPORTED A NUMBER ONE HYDRAULIC PUMP FAIL WITH A HYD 1 LOW QTY INDICATION. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE PRESSURE AND RETURN LINES ON THE NUMBER ONE ENGINE DRIVEN PUMP, SERVICED THE NUMBER ONE HYDRAULICS, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.