As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) OIL WAS NOTICED LEAKING FROM THE PUSHROD AREA. THE PUSHROD WAS REMOVED TO REPLACE THE SEALS. THE CRACK IN THE CYLINDER HEAD WAS FOUND THEN. THE CRACK RAN FROM THE BOTTOM OF THE CYLINDER HEAD SEAM TO ABOUT 4-5 INCHES ALONG THE HOLLOW WHERE THE PUSHROD TUBE RESIDES. THE CYLINDERS WERE MANUFACTURED NEW STEEL AT OVERHAUL. (TC NR 20070423005)