As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT RETURNED TO THE FIELD AFTER RECEIVING A FLIGHT DIRECTOR, FLIGHT GUIDANCE AND A LEFT ATTITUDE FAIL WARNING MESSAGES. MAINTENANCE INSPECTED AND REPLACED THE NR 1 ATTITUDE HEADING REFERANCE (AHRS) COMPUTER, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 34-21-20. OPERATIONAL CHECKS WERE SATISFACTORY, AND THE AIRCRAFT WAS RETURNED TO SERVICE.