What was found
CREW REPORTED A NR 1 ENGINE THRUST REVERSER FAIL MESSAGE ILLUMINATED DURING FLIGHT. THE CREW SHUTDOWN THE NR 1 ENGINE AND THE AIRCRAFT LANDED AT GSO WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND PLACED THE NR 1 THRUST REVERSER ON MEL. AFTER TROUBLESHOOTING THE NR 4 STOW AND TRANSIT, SWITCH WAS FOUND TO BE FAULTING. THE AFFECTED SWITCH WAS REMOVED AND REPLACED, THE AIRCRAFT WAS OPERATIONALLY CHECKED, THE MEL CLEARED, AND THEN RETURNED TO SERVICE.