As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE TORQUE REMAINED AT 60 PER CENT WHEN ENGINE TRANSITIONED FROM HIGH TORQUE TO GROUND IDLE. OPERATION ABOVE 60 PER CENT APPEARED NORMAL. CAUSE DETERMINED TO BE FAILURE OF THE TORQUE METER TO BLEED PRESSURE DURING ENGINE TORQUE TRANSITION. ENGINE GEARBOX REMOVED AND REPLACED.