I am looking for a schematic to the 10 i/os relay. Would anyone have something available or a site to go to? 

I have a unit that the Nano is programable, runs, but no inputs are happening. This has been working well for over 3 years as a hydraulic transmission controller in a Case front end loader. I've swapped out this unit with another and it is working again, but I would like to know why this one failed. 

 I've checked the voltage on the input regulators section of the Nano board and everything seems correct. Just no inputs available.

I contacted support and was able to receive the power stage schematic(close but a few parts aren't' shown)  but as it's discontinued, there won't be much more. I need a bit more than that.