As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING CLIMBOUT, THE PROPELLER FEATHERED WITHOUT THE PILOT INPUT. THE PILOT THEN NOTICED THAT OIL PRESSURE HAD REDUCED INTO THE RED AND THE LOP WARNING ILLUMINATED. THE ON GROUND INSPECTION REVEALED THAT THE PROP WAS STIFF TO TURN.