What was found
IAH - FLIGHT 2470, THE CREW REPORTED THE BACKUP PITCH TRIM TO BE INOPERATIVE DURING TAKEOFF. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE HORIZONTAL STABILIZER ACTUATOR, OPERATIONALLY TESTED WITH NO DEFECTS, TEST FLEW SATISFACTORILY, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.