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 0830 HRS ON 6-5-98, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LT AOA HEAT INOPERABLE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND COULD NOT DUPLICATE PROBLEM, OPS CHECK OK. AIRCRAFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)