As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE ENGINE WAS DISASSEMBLED TO FACILATE INSP BECAUSE OF METAL IN THE OIL. UPON VISUAL INSP, A CRACK WAS DISCOVERED ORGINATING AT THE CURVIC COUPLING END OF THE SHAFT. THE CRACK MEASURED APPROX 4.5 INCHES AND EXTENDED APPROX 270 DEGREES AROUND THE SHAFT.