As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT NR 1388 - DURING CRUISE, THE HYDRAULIC PRESSURE AND HYDRAULIC QUANTITY WENT TO ZERO. AIRCRAFT MADE AN EMERGENCY LANDING. LANDING WAS OVERWEIGHT BUT LANDED WITHOUT INCIDENT. REPLACED RUDDER HYDRAULIC PACK SEAL AND SERVICED SYSTEM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)