As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED LEFT HYDRAULIC PRESSURE LOW LIGHT ILLUMINATED AND QUANTITY INDICATED LOW. TURNED OFF LEFT HYDRAULIC PUMP. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED HYDRAULIC LINE IN NOSE WHEEL THAT WAS CHAFING ON NOSE GEAR/TAXI LIGHT. SYSTEM GROUND CHECK NORMAL OPERATION.