As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED NR 4 CYLINDER FOR REPAIR DUE TO LOW COMPRESSION, EXHAUST VALVE, FOUND CRACKED BUSHING IN CONNECTING ROD FOR WRIST PIN. REMOVED FOR REPAIR AND FOUND INCORRECT NUTS INSTALLED ON CONNECTING ROD ATTACH BOLTS. FURTHER INSPECTION REVEALED ALL CONNECTING ROD ATTACH NUTS INCORRECT. ONLY RECORDED DISASSEMBLY OF ENGINE RECORDED ON NR 1, NR 3 & 6 CYLINDERS REMOVED FOR REPAIR SINCE REBUILD.