As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 4215 - THE CREW REPORTED THAT THE LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. THE CREW PERFORMED AN AIR-RETURN AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT MAIN LANDING GEAR UPLOCK BOX IAW EMB-145 AMM 32-33-10. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)