As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE CENTER ENGINE OIL QUANTITY INDICATION BEGAN DECREASING. CREW SHUT DOWN THE CENTER ENGINE AND RETURNED TO MSP AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED OIL TUBE O-RING AND RESERVICED ENGINE OIL LEVEL. LEAK AND OPERATIONAL CHECK OK.