As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ASSEMBLY OF A TRANSMISSION AFTER OVERHAUL A NEW BATCH OF BOLTS WAS BEING USED. 1 OF THE BOLTS OUT OF THE BAG WAS FOUND TO HAVE BEEN IMPROPERLY DRILLED DURING MFG. THE BOLT WAS DISCARDED AND ALL OTHER BOLTS IN THAT BATCH INSPECTED WITH NO OTHER DEFECTS NOTED.