What was found
DURING CRUISE FLIGHT, THE NR 1 ENGINE OIL FILTER EICAS MESSAGE ENUNCIATED AND N2 VIBRATION LEVEL WAS 4.0 MAX. THE NR 1 ENGINE WAS SHUT DOWN AND THE AIRCRAFT DIVERTED TO CVG AND LANDED WITHOUT FURTHER INCIDENT. GROUND MAINTENANCE FOUND METAL ON CHIP DETECTOR FOR THE NR 1, NR 2, AND NR 3 MAIN SHAFT BEARING COMPARTMENT. THE NR 1 ENGINE WAS REMOVED AND REPLACED. AIRCRAFT RETURNED TO SERVICE.