As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF POWER AND ENGINE ROUGHNESS WAS REPORTED. UPON INSPECTION, CYLINDER NR 2 WAS FOUND TO HAVE LOW COMPRESSION. FURTHER INSPECTION LED TO FINDING A CRACK APPROXIMATELY ONE-HALF WAY AROUND THE CIRCUMFERENCE OF THE CYLINDER BETWEEN THE FINS AT THE JUNCTION OF THE HEAD AND BARREL. CYLINDER WAS REPLACED AND ENGINE WAS RETURNED TO SERVICE. CYLINDER WAS BORED .010 INCH.