As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED DROPPING CHT ON LEFT ENGINE. POST-FLIGHT REPORTED LARGE OIL LEAK. FOUND NR 6 CYLINDER HAD A CRACK THROUGH UPPER BASE FLANGE. FORWARD THREE CYLINDER HOLD DOWN STUDS WERE BROKEN. THIS CYLINDER WAS PURCHASED NEW FROM LYCOMING AT OVERHAUL. STUDS AND CYLINDER WERE REPLACED AND AIRCRAFT WAS RELEASED.