As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 CYLINER REMOVED FOR ZERO COMPRESSION. EXHAUST VALVE SEAT BADLY WORN AND EXHAUST GUIDE VERY LOOSE. INTAKE VALVE ALSO LEAKING AND SEAT IS TOO WIDE. EXHAUST VALVE EXTREMELY LOOSE IN GUIDE. COULD CAUSE HEAD OF VALVE TO BREAK OFF CAUSING A CATASTROPHIC ENGINE FAILURE. SUBMITTER RECOMMENDED CLOSER QUALITY CONTROL OF CYLINDER ASSY, NEW COMPLETE CYLINDER ASSY INSTALLED.