What was found
PILOT HAD ENGINE CHIP LIGHT ILLUMINATION FOLLOWED ALMOST IMMEDIATELY WITH A NOISE/VIBRATION, THEN A POWER LOSS/ DECEL. AC LANDED WITHOUT INCIDENT AND PILOT HAD TO SHUT OFF THE ENGINE. CHIP PLUGS AND OIL FILTERS WERE CONTAMINATED WITH METAL. DISASSEMBLY OF ENGINE AND ENGINE GEARBOX REVEALED A FAILURE OF THE 2.5 BEARING TO A POINT THAT .33 THE CIRCUMFERENCE OF THE SAG SHAFT, INNER RACE, WAS GOUGED TO AN APPROX DEPTH OF .040 INCH TO .045 INCH. NO OTHER SOURCE OF METAL WAS FOUND.