As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT NR 2685 - CREW REPORTED THAT DURING CLIMB THE LANDING GEAR WOULD NOT RETRACT WITH AN AIR/GRD FAIL MESSAGE. THE AIRCRAFT RETURNED TO EWR AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THE LEFT MAIN LANDING WEIGHT ON WHEELS CONNECTOR TO BE DAMAGED. THE AFFECTED CONNECTOR WAS REMOVED AND REPLACED, THE GEAR OPERATIONALLY CHECKED, AND THE AIRCRAFT RETURNED TO SERVICE.