As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) CRANKSHAFT CRACKED INTERNALLY - CRACK LENGTH APPROXIMATELY 50MM (2IN) - THE CRACK WAS LOCATED AT THE BASE OF A CORROSION PIT AND WAS FOUND AFTER THE INTERNAL DIAMETER WAS HONED TO REMOVE THE PIT - FOUND DURING INTERNAL CORROSION INSPECTION OF A CRANKSHAFT IAW LYCOMING SB 505A