The GO2 is still the Hatchi unit, FDR GO is based off the great Shimadzu platform I and others suggested years ago. Glad they got that right. You HAVE to go to the classes to get the service information you're requesting. We all had to sign agreements not to share. :-( Go to the class or call in Fuji if administration won't send you.
BTW Hitachi won't sell any parts in the US for their part of the machine.
If they had started with the Shimadzu MUX-100 for the original GO1 & 2 the vast majority of the users would have been so happy with the resulting device. But we now have a Carestream DRX that kicks butt and has a strong reliability plus high physician satisfaction to boot.