As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OSH - LEFT ENGINE TORQUE GAUGE FLUCTUATED ABOUT 7 PERCENT THEN DROPPED TO LESS THAN 20 PERCENT TORQUE. CAUSED AUTOFEATHER ON LEFT ENGINE. MAINTENANCE INSPECTED AND CLEANED CANNON PLUG ON TORQUE SIGNAL CONDITIONING UNIT AND PCU, NG. OPERATIONAL CHECK OK, HIGH SPEED TAXI CHECK OK. (M)