As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2028 - THE CREW REPORTED A LANDING GEAR AIR/GRND FAIL MESSAGE ON EICAS, AND THE LANDING GEAR WOULD NOT RETRACT. MAINTENANCE REMOVED AND REPLACED THE LGEU, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.