As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) OIL PRESSURE VALVE HSG ON BACK OF ENGINE WAS FOUND LEAKING. MAINTENANCE REMOVED THE VALVE, BUT UPON RE-INSTALLATION, THE VALVE BROKE IN HALF. THE AREA BETWEEN THE SEAT OF THE O-RING AND THE THREADS WAS FOUND CRACKED, CAUSING THE LEAK. THE UNIT WAS REMOVED AND SUBMITTED TO QA. NEW PART INSTALLED AND ACFT RETURNED TO SERVICE.