Cal Audio Sigma II

I purchased one of these units used. How can I tell if I have the 24/96 upgrade or if this was one of the models that came from the factory with the upgrade already installed? My unit has the power button on the rear, along with the input selector
If it is a 24/96 unit, it will have a good sized circuit board stacked on top of the main board. Obviously, you'll have to take the cover off to see this. Sean
Can anybody send me pictures of a 24/96 unit?