As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3996 HAD TO RETURN TO FIELD DUE TO HAVING THE NR 2 RUDDER HYDRAULIC, RUDDER PRESSURE, AND RUDDER FULL PRESSURE LIGHTS ILLUMINATE AFTER TAKEOFF. MAINTENANCE FOUND THE RUDDER PRESSURE REGULATOR VALVE TO BE AT FAULT. THE RUDDER PRESSURE REGULATOR VALVE WAS REPLACED AND THE SYSTEM OPERATIONAL CHECKED AND LEAK CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.