As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - AIRCRAFT EXPERIENCED LOSS OF LEFT HYDRAULIC SYSTEM. EMERGENCY DECLARED, LANDED DFW WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LOOSE LINE ON THRUST REVERSER LEFT CONTROL VALVE. TIGHTENED LEFT CONTROL VALVE LINE. SYSTEM GROUND CHECK NORMAL OPERATION.