As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE NUMBER 1 ENGINE N2 INDICATIONS WERE ERRATIC CAUSING A FLIGHT DIVERSION. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THAT THE NUMBER 1 ENGINE WIRING HARNESS WAS DEFECTIVE. THE HARNESS WAS REPLACED WITH A NEW HARNESS. OPERATIONS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.