As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/BTV - FLT 6265 - DURING CLIMB AT 1214 HRS ON 5-18-97, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO NR 1 AHRS FAILED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS, MAINTENANCE INSPECTED AND REMOVED AND REPLACED NR 1 AHRS, OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)