As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT LOST THE NR 1 HYDRAULIC SYSTEM WHILE IN FLIGHT. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 1 ENGINE LT HYDRAULIC PUMP SUPPLY LINE LEAKING. THE HYDRAULIC SUPPLY LINE WAS REMOVED AND REPLACED. THE HYDRAULIC SYSTEM WAS SERVICED, THE ENGINE WAS RUN AND NO LEAKS WERE DETECTED.