As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND OIL LEAK DURING PREFLIGHT BY STUDENT PILOT. PRESSURE CHECKED OIL COOLER AND FOUND OIL LEAK AT TOP SEAM. THIS IS A WEAK AREA ON THE COOLER. MAY BE CAUSED BY VIBRATION OR IMPROPER INSTALLATION METHODS. REPLACEMENT WITH BETTER COOLER.