As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INSPECTION OF THE OIL SCREEN IT WAS NOTICED THAT THERE WAS FOREIGN MATERIAL IN THE OIL SCREEN. THIS MATERIAL WAS TAKEN TO AN O/H SHOP FOR ANALYSIS. WE WERE INSTRUCTED TO PULL 1 CYLINDER AND LOOK AT THE THE MAIN BEARING AND NOTICED THAT A PIECE OF IT WAS MISSING. THE ENGINE WAS PULLED AND REPLACED.