Where is AUX-2 connector on the Einsy Rambo Board?

Mu understanding is that there are several unused I/O pins on an AUX-2 connector, three of which are available to be configured as Interrupt pins. But I haven't come across any description of the Einsy Rambo that shows the AUX-2 connector.

So I'm hoping that someone might be able to provide a description or image or a l ink that can provide that information for me.