As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NINTH ENGINE COUNTERWEIGHT FAILURE, ONE COUNTERWEIGHT WASHER FOUND BROKEN INTO MANY PIECES DURING A SCHEDULE INSP. THE BROKEN WASHER PIECES CAUSED ONE TAPPET BROKEN AND 2 CONNECT ROD, THE CRANKCASES AND OTHER PARTS BADLY DAMAGED. THE WHOLE ENGINE HAD TO BE DISCARDED.