As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, THE CHIP LIGHT DETECTOR ILLUMINATED. WHEN THE ACFT LANDED THE FLIGHT CREW HEARD A GROWLING NOISE THAT CAME FROM THE MAIN TRANSMISSION AREA. TWO FERROUS NUGGETS WERE FOUND ATTACHED TO THE DETECTOR. IT WAS FOUND THAT THE INPUT PINION GEAR TOOTH FRACTURED AND WAS LYING AT THE BOTTOM OF THE TRANSMISSION MAIN CASE.