As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MAIN TRANSMISSION MAKING ROARING NOISE. AFTER SHUTDOWN THE TRANSMISSION WAS MAKING A CLICKING NOISE. INSPECTION FOUND METAL IN THE FILTERS AND CHIP DETECTORS. TRANSMISSION AND MAST ASSEMBLY WERE REPLACED. TRANSMISSION GEAR SENT TO TSB LABS FOR ANALYSIS ON 29 DEC 99.