What was found
BORESCOPE EXAMINATION REVEALED THE NR 4 CYLINDER HEAD WAS CRACKED. AFTER THE CYLINDER WAS REMOVED, CRACKING WAS SEEN AT THE LOWER SPARK PLUG HOLE. THE CYLINDER HEAD CASTING NR C-02908.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BORESCOPE EXAMINATION REVEALED THE NR 4 CYLINDER HEAD WAS CRACKED. AFTER THE CYLINDER WAS REMOVED, CRACKING WAS SEEN AT THE LOWER SPARK PLUG HOLE. THE CYLINDER HEAD CASTING NR C-02908.