As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 EXHAUST VALVE HEAD MISSING A SECTION (OVERHEATED AND TORCHED AWAY). TRACED TO EXCESSIVE VALVE STEM/GUIDE CLEARANCE. ALL OTHER CYLINDERS WERE REMOVED AND REPORTED TO HAVE EXCESSIVE WEAR, REQUIRING VALVE AND GUIDE REPLACEMENT. 655 HOURS SHORT OF TBO. PLANE WAS 2 MONTHS SINCE LAST ANNUAL AND AT THAT TIME STATIC COMPRESSIONS WERE WITHIN LIMITS.