As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/CLE - FLT 6594 - DURING CLIMB-OUT AT 1230 HOURS ON 4-25-97, EXPERIENCED A FAILURE OF THE NR 1 AIR DATA COMPUTER. AIRCRAFT RETURNED TO IAD. MAINTENANCE INSPECTED THE SYSTEM AND FOUND THE NR 1 ADC HAD FAILED. MAINTENANCE REMOVED AND REPLACED THE AIR DATA COMPUTER AND THEN RELEASED THE AIRCRAFT BACK TO A RETURN TO SERVICE CONDITION. (X)