As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LT HYDRAULIC SYSTEM QUANTITY DEPLETED DURING CLIMBOUT. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LT HYDRAULIC SYSTEM BRAKE FLUID QUANTITY LIMITER FAILED. THE BRAKE FLUID QUANTITY LIMITER WAS REMOVED AND REPLACED. THE LEFT HYDRAULIC SYSTEM WAS SERVICED TO FULL AND LEAK CHECK WAS GOOD. THE NR 1 AND NR 2 BRAKES WERE BLED, SYSTEM PRESSURE CHECKED NORMAL.