Testing a mamba max pro? MMP

[CerberusVI]

So i just received a used mmp from another forum and it doesn't seem to work?

when i plug it into my castle link my castle link gets hot, i tried tested continuity on all 3 legs of the esc wire's and all are fine, he had the switch wires soldered together, tested it soldered and un-soldered.
I finally tested the pcb where the battery connects to and i have input voltage from my battery on the board.

I have tried 2s and 3s batterys, my CC1410 and a tacon motor and still nothing, I beleive i was sold a dud. Is there anything else i should check before i ask for my money back?