As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3816 THE CREW REPORTED THAT AFTER TAKEOFF AND UPON SELECTING GEAR UP, GOT A LANDING GEAR "AIR /GROUND FAIL" MESSAGE. THE LANDING GEAR DID NOT RETRACT. THE CREW DIVERTED TO TUL TO BURN FUEL WITH THE GEAR DOWN. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NOSE LANDING GEAR STRUT ASSEMBLY IAW EMB-145 AMM 32-22-01. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.