As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6150 - IAD-EWR - DURING CLIMB-OUT, RETURNED TO IAD DUE TO THE AHRS FAILING. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED AHRS COMPUTER NR 1. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)