As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT AT FL240, TORQUE FLUCTUATIONS ON TH RT ENGINE WITH A DROP OF APPROXIMATELY 40 OCCURRED. THE ACFT EXPERIENCED A YAW AND ROLL MOMENT. EMERGENCY PROCEDURES WERE FOLLOWED AND THE ACFT RETURNED TO DESTINATION WHERE AN UNEVENTFUL LANDING WAS MADE. POST FLIGHT TROUBLESHOOTING LED TO THE REPLACEMENT OF THE ENGINE ELECTRONIC CONTROL BEFORE THE A/C WAS RETURNED TO SERVICE. OPEN