What was found
IAH- FLIGHT 3844, THE CREW NOTED THAT RUDDER SYSTEM #2 INOPERATIVE DURING INITIAL CLIMBOUT, THE AIRCRAFT RETURNED TO IAH, AND, LANDED WITHOUT INCIDENT. IAH- MAINTENANCE REMOVED AND REPLACED RELAY K0378, PERFORMED A OPERATIONAL CHECK, NO DEFECTS NOTED, AND, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.