As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 4151 - DURING FLIGHT, CREW REPORTED A LANDING GEAR DISAGREEMENT INDICATION. THE AIRCRAFT RETURNED TO IAH WITHOUT INCIDENT. MAINTENANCE REPLACED THE LANDING GEAR ELECTRONIC CONTROL UNIT. THE AIRCRAFT OPERATIONALLY CHECKED GOOD AND WAS APPROVED FOR RETURN TO SERVICE. (X)