As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 421 - SAN TO ONT - EN ROUTE FROM SAN TO GEG FLIGHT CREW REPORTED TOTAL NAV 1 AND 2 FAILURE. DIVERTED TO ONT AN EMERGENCY WAS NOT DECLARED; A/C LANDED SAFELY IN ONT WHERE MX PERSONNEL REMOVED AND REPLACED FLIGHT GUIDANCE CONTROLLER. OPERATIONALLY CHECKED SATISFACTORY AND A/C WAS RELEASED TO RETURN FOR SERVICE.