As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK DURING CLIMB, THE NR 1 ENGINE HAD TORQUE FLUCTUATIONS AND RAPID TEMPERATURE INCREASE. THE CREW ELECTED TO MAKE AN AIR TURN BACK AND THE ACFT LANDED SAFELY AT THE POINT OF DEPARTURE. TROUBLESHOOTING LED TO THE REPLACEMENT OF THE FUEL CONTROL, FUEL PUMP AND TORQUE SENSOR BEFORE THE ACFT WAS RETURNED TO SERVICE.