As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS NR 4 CYLINDER WAS REMOVED BECAUSE OF A VERY LARGE CRACK AROUND THE TOP OF THE HEAD. THIS AND 2 OTHER CYLINDERS WERE REMOVED AND REPAIRED AT 183.0 TSO BECAUSE OF LOOSE VALVE GUIDES AND SEAL TROUBLES. NOW HAS 1,038.9 TSO HOURS AND A CRACKED HEAD.