As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN FLIGHT OPERATION INDICATION OF FIRST POSSIBLE LOW TORQUE AND THEN ENGINE CHIP AND OIL FILTER CHIP, FOLLOWED BY AS SOON AS POSSIBLE LANDING. 01-19-2013 TO DISCOVER BOTH CHIP PLUGS COVERED WITH METAL PARTICLES. ACFT WAS GROUNDED AND TRUCKED BACK TO MAIN BASE. ENGINE REMOVED FOR INSPECTION, ACCESSORY GEARBOX WAS OPENED AND A SHEARED BOLT WAS FOUND ON THE TORQUE IDLER GEAR. 4TH SIMILAR ISSUE WITHIN OUR FLEET.