What was found
(CAN) AT FL410, IN CRUISE FLIGHT, THE CREW REPORTED AN ENG TEMP OSCILLATION. THE CREW ELECTED TO DIVERT & PERFORMED AN UNEVENTFUL LANDING. THE TROUBLESHOOTING REVEALED A DEFECTIVE T1 HARNESS. THE PART WAS ORDERED. MFG WILL INVESTIGATE TO ESTABLISH ROOT CAUSE & PROVIDE INFORMATION THROUGH SUBSEQUENT SERVICE DIFFICULTY REVIEW MEETING & SUPPORTING DOCUMENTS OR OTHER AGREED UPON COMMUNICATIONS.