As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS CYLINDER WAS IN THE NR2 POSITION AND IS A TYPE (A) HEAD. THIS CRACKED CYLINDER HEAD WAS FOUND AT THE 100 HOUR INSPECTION. WE ARE FINDING SIGNS OF AIR LEAKAGE ON THE EXHAUST SIDE OF THE CYLINDER HEAD WHEN DOING A COMPRESSION CHECK. WE ARE SPRAYING SOAPY WATER ON THE CYLINDER HEAD.