As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 6381 PHX TO EUG - SHUTDOWN NR 1 ENGINE AND DIVERTED TO SMF DUE TO A OIL PRESSURE FLUCTUATION. MX IS IN THE PROCESS OF TROUBLE SHOOTING. OPEN PENDING RESOLUTION. RECOMPLIED WITH MEL FOR EDP. UPON INSPECTION FOUND EDP SPLINE PLUG HAD FALLEN OUT. INSTALLED NEW O-RING AND SPLINE PLUG SERVICED AND PERFORMED OIL CONSUMPTION TEST. NO DEFECTS NOTED ENG DID NOT CONSUME ANY OIL.