As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE TRANSMISSION SHOP WAS INSPECTING THE AFT TRANSMISSION THAT WAS IN FOR REPAIR. THE MECHANIC FOUND THE INNER RACE OF THE BEARING SPALLED BADLY. THERE WERE NO OTHER INDICATIONS OF ANY OTHER PROBLEMS WITH THE BEARING DUE TO BEING INSTALLED IMPROPERLY.