As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DUE TO PREVIOUS IMPULSE COUPLING FAILURES, WE HAVE IMPLEMENTED AN INSPECTION OF THE IMPULSE COUPLING EVERY 100 HOURS. THIS IMPULSE COUPLING HAD A LOOSE RIVET ON ONE OF THE PAWLS. IF THE RIVET WAS TO SHEAR THERE WOULD BE SIGNIFICANT DAMAGE TO THE ENGINE.