As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AREA AROUND THE NUTPLATE NEAREST TO THE PROPELLER ON THE AFT SPINNER BULKHEAD HAD CRACKED AND BROKEN FREE OF THE BULKHEAD IN FLIGHT. THE SECTION OF THE SPINNER ATTACHED TO THE BROKEN PIECE WAS PULLED AWAY FROM THE BULKHEAD. THE SPINNER HAD STARTED TO DEVELOPE CRACKES ALONG THE BEND RADIUS. BOTH THE SPINNER AND AFT SPINNER BULKHEAD WERE REPLACE WITH FACTORY NEW.