What was found
ON CLIMBOUT OF KGRR EN ROUTE TO KMEM THE RT THRUST REVERSER UNLOCKED MESSAGE ILLUMINATED. THE FLIGHT CREW PERFORMED THE QRH WHICH REQUIRED LANDING AT THE NEAREST SUITABLE AIRPORT. KFWA WAS TEN MINUTES AWAY. THE FLIGHT CREW DECLARED AN EMERGENCY AND REQUESTED TO LAND AT KFWA DUE TO CLEAR RUNWAY CONDITIONS AND BECAUSE IT WAS A COMPANY MAINTENANCE BASE. AN OTHERWISE NORMAL APPROACH AND LANDING WAS MADE AT KFWA. MAINTENANCE INSPECTED THE AIRCRAFT AND DEFERRED THE THRUST REVERSER. THE AIRCRAFT WAS RELEASED FOR SERVICE BUT WAS SCHEDULED INTO A HANGAR FOR THAT NIGHT. NIGHT MAINTENANCE AT FWA REPLACED THE RT THRUST REVERSER POWER DRIVE UNIT.