As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER 35 MINUTES OF A 45-MINUTE FLIGHT, THE OIL TEMPERATURE STARTED TO RISE, BUT NEVER HIT RED LINE. A SAFE LANDING WAS MADE. OIL WAS DRIPPING OFF RT SIDE OF COWL AND FIREWALL ENGINE WAS WASHED DOWN AND LEAK CHECKED REVEALED THE OIL COOLER HAD SPLIT AT THE BEAD LINE OF THE LOWER PASSAGE WAY. NEW COOLER HAD TO BE INSTALLED.