PX4IO not found - 3.3v regulator?

I am getting a PX4IO board not found error on boot of my newish Pixhack. Looking through various forums, it seems an issue may be the 3.3v regulator has broken (understandable, I did some silly stuff with power supply early on). 

Where is this located/how can I test this on the Pixhack? Similar, but not the same as the Pixhawk. 

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