As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6603 - IAD-EWR - DURING TAKEOFF, MADE AN UNSCHEDULED LANDING DUE TO NR 2 AHRU FAILURE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEM. MAINTENANCE INSPECTED AND REMOVED AND REPLACED NR 2 AHRU, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)