What was found
FLIGHT 4039 NORFOLK TO LGA REPORTED HAVING A RUDDER TRIM ACTUATOR RUNAWAY CONDITION. CREW FOLLOWED THE ABNORMAL PROCEDURES CHECKLIST AND CONTINUED THE FLIGHT WITHOUT FURTHER INCIDENT. MAINTENANCE IN LGA TROUBLESHOT SYSTEM AND FERRIED AIRCRAFT TO MIDDLETOWN FOR MAINTENANCE. MAINTENANCE FOUND THE RUDDER TRIM SWITCH TO BE HANGING UP WHEN SELECTED TOWARDS THE LEFT HAND POSITION. SWITCH WAS REMOVED AND REPLACED. SYSTEM WAS OPERATIONAL CHECKED. ALL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.