What was found
IAH- FLIGHT 3558, THE CREW NOTED THAT THE RUDDER SYSTEMS #1 & #2 INOPERATIVE, ON DEPARTURE FOR (TYS), THE CREW DECLAIRED EMERGENCY, AND, PERFORMED AN EMERGENCY DESCENT. THE AIRCRAFT RETURNED TO (IAH), AND, LANDED WITHOUT INCIDENT. IAH- MAINTENANCE REMOVED AND REPLACED THE #1 RUDDER SYSTEM PRESSURE SWITCH, PERFORMED A OPERATIONAL CHECK, NO DEFECTS NOTED, AND, THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.