As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING, THE CREW OBSERVED ABNORMALLY LOW TGT VALUE ON NR 1 ENGINE. THE AIRCRAFT RETURNED TO POINT OF DEPARTURE. MAINTENANCE FOUND CHAFED WIRING AT THE TGT JUNCTION BOX, THE EXTERNAL CALIBRATION TEST CONNECTOR ASSY WAS REMOVED AND THE AIRCRAFT RETURNED TO SERVICE AFTER OVERWEIGHT LANDING INSPECTION.