What was found
(CAN) AT FL410, THE CREW REPORTED THAT THE ACFT HAD A YAW FOLLOWED BY THE RT ENGINE ROLLING BACK TO APPROXIMATELY 60 PERCENT N1, FOLLOWED BY THE CYAN R ENGINE FAULT CAS MESSAGE POSTING. AFTER A COUPLE OF SECONDS, THE RT ENGINE SPEED RECOVERED AND THE CAS MESSAGE CLEARED. NO FURTHER ISSUES WERE REPORTED FOR THE REMAINDER OF THE FLIGHT UNTIL TOUCHDOWN WHEN THE CYAN R ENGINE, MINOR FAULT MESSAGE POSTED. POST FLIGHT INSPECTION OF THE ENGINE FOUND A CHAFE DAMAGE ON THE W6 HARNESS. THE ENGINE DOWNLOAD REVEALED SOME ECU AND IGNITION FAULTS LOGGED AT THE TIME OF THE OCCURRENCE. THE W6 HARNESS AND ECU B WERE REPLACED AND THE ACFT RETURNED TO SERVICE.