What was found
(CAN) IN FLIGHT LOSS OF NR 2 AC BUSS SERVICES CAUSED BY NR 2 GENERATOR DROPPING OFF LINE. RESET ATTEMPTS FAILED. DUE TO AN AD IN EFFECT ON THE REMAINING GENERATOR, A LANDING AT THE NEAREST AIRPORT WAS CARRIED OUT. DURING FAULT ISOLATION IT WAS FOUND THAT THE GENERATOR WAS DISPLAYING AN OVER VOLTAGE CONDITION ON THE VOLTAGE CHECK. THE NR 2 GCU WAS SWAPPED WITH NR 1 AND THE OVER VOLTAGE CONDITION TRANSFERRED TO THE NR 1 SYSTEM. AS THE VOLTAGE REGULATOR SECTION OF THE GCU IS BELIEVED TO BE AT FAULT, SERVICEABLE GCU WAS INSTALLED AND NORMAL SYSTEM OPERATION WAS RESTORED.