What was found
THE FLIGHT CREW REPORTED THAT THE NR 1 ENGINE N2 INDICATIONS WERE ERRATIC IN FLIGHT. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THAT THE NR 1 ENGINE HARNESS WAS DEFECTIVE. THE MX VENDOR REPLACED THE WIRING HARNESS WITH A NEW HARNESS. OPERATIONS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE. NOTE: THIS IS THE THIRD SDR REPORT REGARDING THE FAILURE OF AN ENGINE WIRING HARNESS. THE COMMON DENOMINATOR WITH THE REPORTED DEFECTIVE HARNESSES IS THAT THE SERIAL NUMBER OF EACH BEGAN WITH A 15-######. THE LATEST HARNESS INSTALLED THE SERIAL NUMBER STARTED WITH A 16-######. SO FAR ALL INDICATIONS IS THAT THE N2 INDICATION FAULT IS CLEARED.