As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE INSPECTION, A SMALL MARK, SLITE DENT WAS FOUND ON THE OUTER DISC OF THE FLEX COUPLING FURTHER INVESTIGATION FOUND THAT THIS DENT HAD SET UP A STRESS RISER IN WHICH HAD CAUSED THE DISC TO CRACK THE COUPLING WAS REPLACED WITH NEW PARTS AND RETURNED TO SERVICE.