As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WAS IN FOR INSP AND THE MECHANIC CUT THE OIL FILTER OPEN TO CHECK FOR METAL, THERE WAS METAL IN THE OIL FILTER. THE ENGINE WAS SENT TO US FOR A METAL CONTAMINATION INSP, UPON OUR FINDINGS THERE WERE SEVERAL LIFTER BODIES THAT WERE BADLY SPALLED.