As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT T1866/19SEP - DURING CLIMB CREW RECEIVED LEFT HYDRAULIC QUANTITY INDICATION FOLLOWED BY LOSS OF LEFT HYDRAULIC SYSTEM PRESSURE. USED ALTERNATE FLAP EXTENSION AND GEAR PROCEDURES. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. FOUND LEFT HYDRAULIC LINE DAMAGE. REPLACED FLEX LINE IN RIGHT WHEEL WELL. SYSTEM GROUND CHECKED NORMAL OPERATION.