Ahh.. this might be it: on the copper side of the board, there are tiny little resistors near each MOSFET. One side of each resistor connects to the Gate, but I cannot see where the other side connects.
Have a look and figure that out for us, will ya?
If they connect to what used to be the big fat ground trace, then that's the problem. You'll need to somehow restore a true ground to that side of each of the resistors.
Ahh.. I think that's it. What I thought (from the photo) were gaps, are just the black silk-screened markers for placing the resistors. So those need ground.
Which means you'll need to repair things. I recommend STRONGLY that you avoid soldering anything directly to the resistor pads -- the resistors will likely detach.. ugh.
So, three more cuts (where we should have put them in the first place), and then repairs to the original cuts on the ground:
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