As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH ABOUT 500' TO TOUCHDOWN THE LEFT ENGINE WENT INTO FEATHER (NO INDICATION ON CWP). ALL ENGINE INSTRUMENTS WERE NORMAL EXCEPT TORQUE AT 0 LBS. TORQUE WAS SET BETWEEN 500-1000 LBS. UPON TOUCHDOWN, LEFT ENGINE CAME OFF FEATHER AND RETURNED TO NORMAL. AFTER EXITING THE RUNWAY, PILOT NOTICED OIL PRESSURE DROPPING. AS THE PILOT SHUTDOWN THE LEFT ENGINE ON THE TAXIWAY THE "OIL L" ANNUNCIATOR LIGHT INDICATED ON THE CWP.