As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REPLACEMENT OF THE S16 SHAFT, IT WAS DISCOVERED THAT THE OUTER LAND OF THE SNAP RING GROOVE WAS VERY THIN AND THE INNER EDGE WAS LIFTING AND (2) .3750 INCH LONG PIECES CAME OFF OF THE LAND. WHEN THE SNAP RING WAS REMOVED THE GROVE FOR THE SNAP RING SEEMS TO BE THE NORMAL DIMENSION. (K)