As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/CLE - FLT 6551 - DURING CLIMB AT 1740 HOURS ON 3-24-98, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO LT ENGINE TORQUE AND RPM FLUCTUATION. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED PROPELLER GOVERNOR, OPS CHECK OK. AIRCRAFT RELEASED AND RETURNED TO SERVICE. (X)