As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 5535 - STL - LANDING GEAR AIR/GROUND FAILURE MESSAGE ON EICAS. MAINTENANCE INSPECTED AND FOUND THE NLG PROXIMITY SENSOR TARGET OUT OF ADJUSTMENT. TARGET AND SENSOR WHERE RE-ALIGNED AND AN OPERATIONAL CHECK WAS PERFORMED WITH NO DEFECTS NOTED.