As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3209 - AFTER DEPARTURE FROM MSP, THE NR 2 AHRS FAILED. THE CREW ELECTED TO RETURN TO MSP AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL REPLACED THE NR 2 AHRS COMPUTER AND REPAIRED A PIN IN THE AHRS COMPUTER CONNECTOR. ALL SYSTEMS OPERATED SATISFACTORILY. (X)