As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE 100 HOUR INSPECTION, THE NR 2 CYLINDER WAS FOUND TO HAVE COMPRESSION OF 30/80 WITH LEAKAGE OUT THE INTAKE VLV. THIS IS THE THIRD OCCURRENCE OF THE SAME PROBLEM ON THIS FACTORY OVERHAULED ENG IN LESS THAN 500 HOURS SINCE OVERHAUL. THE FIRST TWO WERE THE NR 3 CYLINDER AT 294 HOURS SINCE OVERHAUL, FOLLOWED BY NR 5 AT 384 HOURS SINCE OVERHAUL. FOR COMPARISON, PRIOR TO THIS IN OVER 10,000 HOURS OF ENG OPERATION WITH IO540K SERIES WE HAD NOT HAD TO PULL A CYLINDER DUE TO LOW COMPRESSION.