As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TEAR DOWN INSPECTION, FOUND IDLER GEAR FLOATING FREE IN GEAR POCKET. FOUND IDLER STUB BROKEN OFF AND EXTENSION DAMAGE TO GEAR POCKET. METAL FROM GEAR POCKET WAS INTRODUCED INTO ENGINE OIL SYSTEM. IT IS SUSPECTED THAT DAMAGE WAS CAUSED BY LACK OF LUBRICATION OR PREVIOUS METAL CONTAMINATION.