As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON PLACING FLAPS AT 5 UNITS, STATUS MESSAGE NOSE AIR GROUND DISAGREE DISPLAYED. MAINTENANCE EICAS PAGE SHOWED "NOSE GEAR LOCKED" AND "NOSE GEAR DOWN" MESSAGES. CLEANED NOSE GEAR SENSORS. BITE TESTED PROXIMITY SENSOR ELECTRONICS UNIT -NO PROBLEMS NOTED.