As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE A-SYSTEM HYDRAULIC QUANTITY DROPPED TO ZERO FOLLOWED BY LOSS OF PRESSURE ON NR 2 ENGINE WHILE EN ROUTE. AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 2 ENGINE DRIVEN HYDRAULIC PUMP LEAKING. THE PUMP WAS REMOVED AND REPLACED, THE HYDRAULIC RESERVOIR WAS SERVICED, THE ENGINE WAS RUN AND ALL OPERATION AND LEAK CHECKS WERE GOOD.