As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR FLT 2657 THE CREW REPORTED A LANDING GEAR AIR/GROUND FAIL MESSAGE DURING CLIMBOUT. THE AIRCRAFT DIVERTED INTO CLE AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE RIGHT GEAR AFT AIR/GROUND PROXIMITY SWITCH. OPERATIONAL CHECKS WERE GOOD.