As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE BEGAN RUNNING ROUGH. NR 1 CYLINDER EXHAUST ROCKER PUSH ROD BARREL PN 39288 WAS FOUND BROKEN JUST BELOW STEEL BALL FITTING PN 11473. PART FATIGUE COULD HAVE PLAYED A PART. TOTAL TIME ON PART UNKNOWN. TOTAL TIME ON ENGINE WAS 6256.3 HOURS. TIME SINCE OVERHAUL, 124.1 HOURS.