Stuck in error state

The grip came apart on the inner side and it caused a small tear in the ribbon cable (the big ribbon cable). Now the controller can't leave the error state, it always flashes red from charge or power on and after hard resets. I think replacing the big ribbon cable would fix it, is there somewhere i can buy it and instructions to replace it?

Open to any suggestion of what's causing this

This is the only damage that i could find. It's a very small tear. I suspect that this is the problem because the grip was loose on that side, it put stress right on that cable. I started getting the error state about 4 months ago, hard reset had always gotten it to work again. Recently the grip broke off and hard resets don't fix it anymore, so i took it apart and this is the only thing that looks wrong.