As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: JUST AFTER LEVEL OFF AT CRUISE ENGINE 1 OIL QUANTITY LOW ADVISORY. LEVEL RANGE BETWEEN 2.5 - 3.5 QTS. WE IDLE ENG 1 FOR DURATION OF FLIGHT. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO BZN WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE THE LEFT ENGINE MASTER CHIP DETECTOR LEAKING OIL AND REPLACED IT PER AMM 79-21-50. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.