As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - ATB - FLT - 315 - LOG - 7249002 - AIRCRAFT LOST LT HYDRAULIC SYSTEM PRESSURE 20 MINIUTES INTO FLIGHT. AIRCRAFT RETURNED TO PHX. THE LANDING WAS UNEVENTFUL. MAINTENANCE DISCOVERED A HYDRAULIC LINE IN THE LEFT HAND PYLON AREA THAT HAD BEEN CHAFFED THREW BY A CLAMP. MAINTENANCE REPLACED THE LINE. AS A PRECAUTIONARY MEASURE MAINTENANCE REPLACED THE ENGINE DRIVEN PUMP, ELECTRIC HYDRAULIC PUMP, AND THE NR 1 SYSTEM HYDRAULIC FILTERS.