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 WARNING LIGHT ILLUMINATED SHORTLY AFTER TAKEOFF. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT ENGINE DRIVEN PUMP LOW PRESSURE SWITCH. SYSTEM GROUND CHECK NORMAL OPERATION.