As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT WAS AIRBORNE FOR APPROXIMATELY 10 MINUTES WHEN ENGINE OIL TEMPERATURE OBSERVED HIGHER THAN USUAL. ENGINE SEEMED TO RUN ROUGH, AIRCRAFT RETURNED TO AIRPORT AND LANDED WITHOUT INCIDENT. UPON INSPECTION FOUND NR 6 CYLINDER IN AN ALMOST SEIZED CONDITION. RINGS WERE SEIZED TO PISTON. CYLINDER ASSEMBLY REMOVED FROM SERVICE AND NEW ASSEMBLY INSTALLED. GROUND RUNS COMPLETED NO FURTHER FAULTS NOTED. (TC NR 20060206011)