As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT NR 2676 THE CREW REPORTED A AIR/GROUND FAIL MESSAGE AFTER TAKEOFF FROM CLE. THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO CLEVELAND AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE NOSE LANDING GEAR STRUT ASSEMBLY. OPERATIONAL CHECKS WERE GOOD.