As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRANKSHAFT REMOVED FROM REBUILT ENGINE DURING OVERHAUL WAS FOUND TO HAVE NUMEROUS HEAT CRACKS IN ALL FORWARD FILLETS OF CRANKPINS. FILLET RADII OF ALL CRANKPINS AND MAIN JOURNALS WERE FOUND BELOW TOLERANCES OF OVERHAUL MANUAL. CRANK WAS .010 INCH UNDERSIZE, AND CRACKS WERE APPARENTLY CAUSED AND UNDETECTED BY IMPROPER GRINDING TECHNIQUES.