As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE REPLACEMENT OF THE CRANKSHAFT SEAL THE AIRCRAFT FANWHEEL WAS REMOVED AND THE MOUNTING HUB WAS FOUND CRACKED. IN ADDITION, THE FANSHAFT WAS GOUGED FROM THE CRACK IN THE FANWHEEL MATING SURFACE. BOTH COMPONENTS WERE REPLACED. THE CAUSE OF THE CRACK IS UNKNOWN.