As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SWF/IAD - FLT 6221 - DURING CRUISE AT 1600 HOURS ON 8-20-97, MADE AN UNSCHEDULED LANDING DUE TO RT ENGINE TORQUE AND EGT FLUCTUATION WITH TTL ON. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND CLEANED ZONE NR 2 CANNON PLUG AND GROUND RAN AIRCRAFT, OPS CHECK OK. AIRCRAFT RELEASED AND RETURNED TO SERVICE. (X)