As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5577, IAH TO CRP. DURING CLIMB THE CREW REPORTED THAT THE FIRST OFFICER`S ATTITUDE AND HEADING REFERENCE DATA DISAPPEARED WHEN THE AUTO-PILOT WAS ENGAGED. THE ACFT RETURNED TO IAH AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND FAULT CODES FOR BOTH THE NR 2 AHRS COMPUTER AND NR 2 FCC CARD ON THE MDC. BOTH WERE REPLACED AND NO FURTHER FAULTS WERE NOTED. (S)