As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CRANK PIN OF THE REAR HALF CRACKED FROM THE CRANK PIN RADIUS THRU TO THE REAR MAIN BEARING RADIUS. AFTER CLEANING AND CLOSE EXAMINATION, IT IS OUR OPINION THAT THE CRACK ORIGINATED AT THE CRANK PIN RADIUS. MACHINE MARKS ON THE REMAINING PORTION OF THE RADIUS INDICATE A PREVIOUS REWORK OF THIS AREA. (K)