As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
METAL PARTICLES WERE FOUND IN OIL FILTER DURING OIL CHANGES, APPROX 100 HRS AFTER MAJOR O/H. ALL CYLINDERS WERE REMOVED AND INSPECTED. FOUND NR 5 CYLINDER NICKLE PLATING PEELING AT THE BASE OF THE CYLINDER. PISTON AND RINGS WERE SCUFFING THE PEELING AREA CREATING PARTICLES IN THE OIL. ENGINE HAS BEEN REMOVED FROM SERVICE AND DISASSEMBLED FOR CONTAMINATION INSP.