Traxxas Aton Flight Board

So i have a Traxxas Aton. I am almost positive that the Flight controller is a re purposed px4. I am wondering if anyone can help me figure out how to use a non Traxxas Radio with this? I can solder or read a diagram I just do not know how to trace the signal wires at all. PLEASE HELP!!!

So i have a Traxxas Aton. I am almost positive that the Flight controller is
a repurposed px4. I am wondering if anyone can help me figure out how to use
a non Traxxas Radio with this? I can solder or read a diagram I just do not
know how to trace the signal wires at all. PLEASE HELP!!!

traxxas have published their changes to ArduPilot here:

It might be that you can track back from their changes to determine how
their radio is connected.

Yours,

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Any Idea on how to do that. I have no programming experience at all.