As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED RECEIVING A LANDING GEAR AIR/GND FAILURE MESSAGE ON THE EICAS AND THAT THE GEAR WOULD NOT RETRACT. MAINTENANCE ADJUSTED THE NOSE WOW PROXIMITY SENSOR TARGET AND PERFORMED SEVERAL LANDING GEAR EXTENSION AND RETRACTION CHECKS WITH NO DEFECTS NOTED.