As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2412, THE CREW REPORTED THAT THE LANDING GEAR TOOK LONGER THAN NORMAL TO RETRACT, AND RECEIVED A LANDING GEAR LEVER DISAGREE MESSAGE ON EICAS. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND SERVICED THE LANDING GEAR HYDRAULIC ACCUMULATOR, OPERATIONALLY TESTED WITH NO DEFECTS. AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.