As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A DUAL TRAINING FLIGHT THE PILOT NOTICE THE OIL PRESSURE DROPPING AND THE OIL TEMP CLIMBING. A PRECAUTIONARY ENGINE SHUTDOWN WAS PERFORMED, AND THE AIRCRAFT RETURNED TO THE AIRPORT. THE INVESTIGATION REVEALED THE L/H OIL COOLER HAD CRACKED ALONG THE BOTTOM SEAM. TOTAL TIME SINCE NEW ON THE OIL COOLER WAS 119.9 HRS.