As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND OIL LEAK ON PREEFLIGHT INSPECTION BY STUDENT PILOT. PRESSURE CHECKED OIL COOLER AND FOUND OIL COOLER LEAKING AT SEM ON TOP. THIS IS A WEAK AREA ON THE OIL COOLER, COULD BE CAUSED BY VIBRATION AND NOT USING A BACK UP WRENCH WHEN INSTALLING OIL COOLER HOSES. RECOMMEND FINDING A REPLACEMENT THAT IS MORE DURABLE.