What was found
IAH - FLIGHT 2878, THE CREW REPORTED COMING OUT OF PIT THAT THE GEAR WOULD NOT RETRACT WHEN COMMANDED, AND RECEIVED EICAS WARNING LG/LEVER DISAGREE. THE GEAR EVENTUALLY RAISED AND THE AIRCRAFT CONTINUED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT, OPERATIONALLY CHECKED THE EXTENSION/RETRACTION SYSTEM WITH NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.