As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: HYDRAULIC SYSTEM-A ELECTRIC PUMP LOW PRESSURE LIGHT CAME ON DURING TAKEOFF. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT DFW. REMOVED AND REPLACED SYSTEM-A HYDRAULIC SYSTEM EMDP PRESSURE SWITCH. PER AMM 29-34-21. LEAK AND OPERATIONAL CHECK GOOD.