As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2756 - EWR - FLIGHT CREW REPORTED LANDING GEAR AIR GRD FAIL MESSAGE JUST AFTER LIFT OFF AND GEARS COULD NOT BE RETRACTED. CREW PERFORMED AIR RETURN AND LANDED UNEVENTFULLY. EWR MX REMOVED AND REPLACED RT L/G TRAILING WOW PROXIMITY SWITCH AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE. (S)