What was found
CYLINDER HEADS FOUND TO BE CRACKED. ALL OF THE CYLINDERS WERE INSTALLED NEW FEB 15,2012. ACFT HAS BEEN FLOWN 404.3HRS. PILOT HAD LOSE OF POWER AND RETURNED TO AIRPORT. 2 CYLINDERS FOUND CRACKED AND LEAKING DURING COMPRESSION CHECK. REMAING CYLINDERS COMPRESSION CHECKED OK. VISUAL INSP OF CYLINDERS REVIELED THAT 5 OF THE 6 WERE CRACKED. SN OF CRACKED CYLINDERS ARE AS FOLLOWS; 52119-16, 52119-19, 52119-22, 52119-24, 52119-25