As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 096 - ONT TO ONT - DURING CLIMB FLIGHT CREW HAD A MESSAGE ON EICAS STATING LANDING GEAR AIR/GND FAIL. THE AIRCRAFT RETURNED TO ONT WHERE IT LANDED WITH OUT INCIDENT. MX REMOVED AND REPLACED RIGHT AIR GROUND WOW SWITCH AND HARNESS, CLEANED NOSE PROX SWITCHES OPERATIONALLY CHECKED WITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED TO RETURNED FOR SERVICE.