What was found
MQB - FLT 3944 - AIR TURN BACK - AFTER SETTING CTOT, THE LEFT ENGINE CONTINUED TO CLIMB TO 120 PERCENT PLUS TORQUE. CREW DEPARTED AND RETURNED TO MQB. AN OVERTORQUE INSPECTION WAS PERFORMED ALONG WITH A GROUND RUN IN WHICH THE PROBLEM COULD NOT BE DUPLICATED. THE AIRCRAFT WAS FERRIED TO LAW FOR AN OVERWEIGHT LANDING INSPECTION. THE ECU AND TORQUE/HP SENSOR, SN SIM2A385, WERE REPLACED AS A PRECAUTION. AIRCRAFT RETURNED TO SERVICE. (X)