As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ENGINE RUNNING ROUGH. UPON REMOVING PROP SPINNER, THE FORWARD SPINNER BULKHEAD WAS FOUND CRACKED. FURTHER INSPECTION REVEALED THE PROP HUB WAS COMPLETELY CRACKED THROUGH, FORE TO AFT, IN IRREGULAR PATTERN BEGINNING AT ONE BOLT HOLE ON AFT SIDE OF HUB TO FACE OF HUB. PROP TRACK CHECKED OKAY. AD 89-26-10 AND SB 169B HAD BEEN DONE AT 3727.6 HRS/9-13-89.