As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - HEADING FLAG CAME ON AFTER TAKEOFF AND NUMBER ON COMPASS DRIFTED OFF 45 DEGREES. AUTOPILOT FAILED. BOTH FLIGHT DIRECTORS FAILED. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. REPLACED NUMBER ONE DIRECTIONAL GYRO. SYSTEM GROUND CHECKED NORMAL OPERATION.