As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON REMOVAL OF THE OIL CHECK VALVE FOR ROUTINE TESTING, THE AMT NOTICED NO OIL FLOWED OUT OF THE LINE GOING TO THE 6&7 BEARING. THE CHECK VALVE WAS FOUND TO BE STICKING OPEN ALLOWING OIL TO FLOW BACK INTO THE GEARBOX WHICH COULD DELAY OIL FLOW TO THE BEARING ON STARTUP. THE AMT WAS A BLT TO UNSTICK THE VALVE BUT IT IMMEDIATELY GOT STUCK OPEN AGAIN WHILE TESTING THE VALVE. THE PART WAS REPLACED WITH A NEW UNIT.