What was found
THE NR 1 TIRE THREW TREAD INTO FLAP WELL RESULTING IN A SHEARED INBOARD SPOILER RETURN LINE AND SUBSEQUENT LOSS OF A SYSTEM HYDRAULICS ON TAKEOFF. THE AIRCRAFT WAS RETURNED TO LAX WHERE IT LANDED WITHOUT INCIDENT. THE SPOILER LINE WAS REMOVED AND A FLEX LINE WAS INSTALLED. A DIP WAS ISSUED TO REPLACE THE FLEX LINE WITHIN 1200 FLIGHT HOURS OR 500 FLIGHTS. THE HYDRAULIC SYSTEM WAS SERVICED. LEAK AND OPERATIONAL CHECKS WERE GOOD. IN ADDITION, THE NR 1 TIRE WAS REPLACED.