What was found
WHILE CLIMBING THROUGH FL390, THE CREW HEARD A SMALL BANG & FELT SOME VIBRATION. THEY RECEIVED A CAS MSG INDICATING THE NR 2 GEN HAD GONE OFFLINE. THIS WAS FOLLOWED BY AN UNCOMMANDED NR 2 ENG SHUTDOWN. THE CREW COMPLETED THEIR CHECKLIST, DECLARED AN EMER, RETURNED & LANDED WITHOUT INCIDENT. INSPECTED THE NR 2 ENG. R & R THE STARTER GEN, THE FMU & THE FMU FUEL PRESS INLET TUBE, DUE TO INLET TUBE CRACK. NO OTHER DEFECTS NOTED.