As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN TURNING BASE IS FINAL, BOTH ENGINES POWER LEVELS WERE ADVANCED FROM IDLE TO NORMAL. THE LEFT ENGINE NR 1 DID NOT RESPOND TO ANY POWER LEVEL SETTING. WITH THE POWER LEVELS IN THE NOTCH, THE LEFT ENGINE NP WAS AT 103.9 BUT THE TORQUE WAS AT ZERO PERCENT. ENGINE SHUTDOWN AS PRECAUTIONARY PROCEDURE. REMOVED AND REPLACED PROPELLER CONTROL UNIT AS PER MM 61-21. (M)