What was found
THE ELECTRIC RUDDER TRIM FAILED IN OPERATION TO THE LEFT WHILE IN CRUISE PORTION OF FLIGHT FROM TPA TO EWR. OPERATION TO THE RIGHT WAS NORMAL. IF MOVED TO THE RIGHT THE TRIM COULD NOT BE RETURNED TO THE LEFT AT ALL. THE AIRCRAFT WAS DIVERTED TO MCO WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RUDDER TRIM SWITCH AT FAULT. THE RUDDER TRIM SWITCH WAS REMOVED AND REPLACED IAW MM 27-11-94 AND FUNCTIONAL CHECKS WERE GOOD.