What was found
IAH - FLIGHT 2966, THE CREW REPORTED THAT THE HYDRAULIC SYSTEM ONE QUANTITY INDICATION WENT TO ZERO DURING FLIGHT. THE CREW DEACTIVATED THE SYSTEM 1 HYDRAULICS, AND LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT WITH NO LEAKS NOTED, CLEANED THE CONNECTOR FOR THE SYSTEM ONE QUANTITY INDICATOR, SERVICED THE HYDRAULIC SYSTEM, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.