What was found
IAH - FLIGHT 2135, DURING CLIMB THE CREW REPORTED THAT THE LANDING GEAR WOULD NOT RETRACT ON TAKE OFF. THE CREW PERFORMED THE QRH, CYCLED THE GEAR WHICH THEN RETRACTED, AND THE AIRCRAFT CONTINUED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR CONTROL LEVER, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.