As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED TO GEG DUE TO LOSS OF NR 1 ENGINE OIL QUANTITY. AIRCRAFT DIVERTED TO GEG DUE TO FLUCTUATING OIL PRESSURE. AMT FOUND EVIDENCE OF LEAK AROUND OIL FILTER HOUSING. DETERMINED THE MAIN OIL FILTER O-RING WAS CUT. REPLACED O-RING, SCREEN, AND PERFORMED 5 MINUTE ENGINE IDLE RUN. NO LEAKS NOTED.