As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING INSPECTION, METAL WAS DETECTED IN BOTH ENGINE OIL FILTERS. THE METAL WAS SENT TO LYCOMING FOR ANALYSIS. IT WAS DETERMINED THE METAL CAME FROM THE HYDRAULIC LIFTER HOUSING. THE TWO ENGINES WERE TAKEN OUT OF SERVICE AND SENT FOR REPAIR.