As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS REPORTED THAT UPON FINAL APPROACH WITH PROPELLERS FULL FORWARD IDLE POWER, THE LT ENGINE CYCLED IN AND OUT OF AUTO FEATHER WITH 500 LBS. OF TORQUE CHANGE. THE ISSUE CEASED TO OCCUR AFTER POWER WAS INCREASED. MX R&R THE LT LOW PRESSURE SWITCH IAW 61-21-00. OPS AND LEAK CHECK WAS GOOD.