As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3385 DURING CRUISE THE CREW REPORTED THE PRIMARY FLIGHT DISPLAY TO BE AMBER AND THE FLIGHT OPERATIONS SYSTEM ALTITUDE HEADING REFERENCE SYSTEM TO BE OFF. THE CREW COMPLIED WITH THE AIRCRAFT OPERATIONS MANUAL AND RETURNED TO DFW. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED NR 2 FLUX VALVE IAW AMM 34-21-02. PERFORMED FUNCTIONAL COMPASS SWING CHECK IAW AMM 34-21-02. THE CHECK WAS GOOD AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.