As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTICED SPARKS COMING FROM THE LEFT ENGINE. THE ENGINE WAS SHUT DOWN AND THE AIRCRAFT LANDED WITHOUT INCIDENT. INSPECTION SHOWED THAT NR 14 CYLINDER HEAD SEPARATED FROM ITS BARREL. REPLACED CYLINDER WITH O/H UNIT AND RETURNED ACFT TO SERVICE.