As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 742 - EN ROUTE DFW-LGA, LEFT HYDRAULIC QUANTITY LOW CAUTION FOLLOWED BY LEFT HYDRAULIC PRESSURE FAILURE. RETURNED AND LANDED DFW WITHOUT INCIDENT. FOUND LEFT MAIN GEAR DOWN LOCK FLEX LINE LEAKING. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)