What was found
(CAN) DURING PRE-FLIGHT AUTOFEATHER/UPTRIM TEST, FLIGHT CREW REPORTED 154 PERCENT OF TORQUE ON THE NR 1 ENGINE. DECISION WAS TAKEN TO FEATHER THE PROPELLER AND RETURN TO GATE BUT LATER ATTEMPTS TO FEATHER THE PROPELLER CAUSED RAPID INCREASE OF TORQUE. FLIGHT CREW DE-SELECTED THE ELECTRONIC ENGINE CONTROL UNIT, EECU, AND FEATHERED THE PROPELLER WITHOUT FURTHER INCIDENT. SOLID STATE FLIGHT DATA RECORDER, SSFDR, WAS DOWNLOADED AND ENGINE DATA FORWARDED TO THE ENGINE MANUFACTURER. SSFDR DATA ANALYSIS CONFIRMED THE OVERTORQUE. THE NR 1 EECU, NUMBER 1 PROPELLER ASSEMBLY AND BOTH ENGINE TORQUE SIGNAL CONDITIONER UNITS, TSCU WERE REPLACED, TESTED AND THE ACFT RELEASED INTO SERVICE.