What was found
(CAN) THE OPERATOR REMOVED THE ENGINE FROM THE AIRCRAFT WHEN HE FOUND EXTENSIVE METAL CONTAMINATION OF THE OIL PRESSURE FILTER. AFTER PERFORMING AN OIL FLUSH, RUN & RECHECK AS SUGGESTED BY THE MAINTENANCE MANUAL. THE ENGINE WAS REMOVED AND SHIPPED TO ATI FOR INVESTIGATION AND CORRECTION.THE CAUSE OF THE METAL CONTAMINATION WAS FOUND TO BE A DAMAGED NR 1 BEARING. THE CAUSE OF THE BEARING FAILURE WAS NOT ABLE TO BE DETERMINED.