What was found
(CAN) EVENT NR 2 INSPECTION, FOUND RT ENGINE METAL PARTICLES IN OIL FILTER, BETWEEN 20-40 PARTICLES. ENGINE SERVICED WITH 15W50 OIL. AIRCRAFT GROUND RUN AND LEAK CHECKED. ONE HOUR TEST FLIGHT, OIL CHECKED AFTER FLIGHT. AT 523.6 HOURS, CUSTOMER DECIDE NOT TO FLY AIRCRAFT. SENT ENGINE FOR OVERHAUL. AFTER ENGINE OVERHAUL, FOUND THAT THE ENGINE CAMSHAFT LOBES WERE WEARING OUT CAUSING METAL PARTICLES IN THE ENGINE OIL.