What was found
DFW - FLT 551 - AFTER TAKEOFF, BOTH STAB TRIM FAULTED, BOTH YAW DAMPER AND NR 2 RUDDER SYSTEM FAULTED. STAB TRIM AND YAW DAMPER WERE RESET. LANDED DFW WITHOUT INCIDENT. REPLACED RUDDER MANIFOLD. SYSTEM GROUND CHECKED NORMAL OPERATION. (M0