As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3402 - LYH-PIT - AFTER TAKEOFF, THE NR 1 ENGINE AUTOFEATHERED AND THE TORQUE INDICATION DROPPED TO ZERO. THE AIRCRAFT TURNED BACK TO LYH AND LANDED WITHOUT INCIDENT. REMOVED AND REPLACED NR 1 ENGINE AND THE TORQUE SENSOR CONTROL UNIT. (M)