PS4 APU & GamePad Tester

Hey, I’m looking for the gamepad tester app Bro uses in his videos on YouTube. Also, I have two PS4s (CUH-1100 & CUH-1200) that I’m pretty sure have bad APUs. I’d like to reball them but would also like to know the probability (assuming the reballing goes perfectly well) of it running good again after the fact. I’ve found a site that has an APU already balled for the CUH-1100, but nothing at all for the other.