As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/BNA - FLT 6700 - DURING CRUISE AT 0745 HOURS ON 4-15-98, AIRCRAFT MADE UNSCHEDULED LANDING DUE TO TAT AND RT PITOT HEAT FAILURE. AIRCRAFT LANDED AT IND AND WENT TO THE GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED AIR DATA SENSOR CONTROLLER, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)