As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- FLIGHT 3935, DURING CLIMB THE CREW NOTED THAT THE GEAR WOULD NOT RETRACT AS SELECTED, GEAR HANDLE DISAGREE. THE CREW RETURNED THE GEAR HANDLE TO THE DOWN POSITION AND RETURNED TO IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR ELECTRONIC UNIT IAW EMB 145 MM 32-32-01 AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.