As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
4068 DUJ/FKL PILOT REPORTED DURING APPROACH WHEN ADDING POWER FROM 500 TO 1000 LBS OF TORQUE LEFT ENGINE WENT IN AND OUT OF AUTOFEATHER. AUTOFEATHER WAS TURNED OFF AND BOTH ENGINES OPERATED AS NORMAL AND WITHOUT INCIDENT. REMOVED AND REPLACED LEFT LOW PRESSURE SWITCH OPERATIONAL CHECK NORMAL. TEST FLIGHT SATISFACTORY.