As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT CARRIED OUT AN UNSCHEDULED LANDING DUE TO FLIGHT DIRECTOR FAILURE DUE TO AHRS FAILURE MESSAGE ON EFIS DISPLAY. AHRS NR 2 BRAKERS WERE RESETED AND CONNECTORS WERE CLEANED IAW MM 34-20-00. BOTH FLIGHT GUIDANCE WERE TESTED IAW MM 22-01-05, ALL CORRECT.