As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) 600/YEARLY INSPECTION BEING CARRIED OUT ON MAIN DRIVESHAFT. UPON REMOVAL OF COUPLING CAP, FOUND SPRING BROKEN IN A DOZEN PIECES. THE PIECES DAMAGED THE INNER COUPLING RENDERING IT UNSERVICEABLE. THE CAP, SPRING AND INNER COUPLING WERE SCRAPED. (X)