As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - ATB - FLT - 920 - LOG 7288157 - AIRCRAFT LOST LEFT HYDRAULIC SYSTEM QUANTITY/PRESSURE. AIRCRAFT RETURNED TO PHX. THE LANDING WAS UNEVENTFUL. MAINTENANCE DISCOVERED A HYDRAULIC LINE IN THE LEFT HAND PYLON AREA HAD BEEN CHAFED THREW BY A CLAMP. MAINTENANCE REPLACED THE LINE.