try starting the system with the keyboard ribbon cable unplugged using the power-on pads on the logic board and see if works properly with an external keyboard. If it does, you will most likely need to replace the internal keyboard or the entire top case.
You most likely will need to replace the keyboard or the whole top case along with the logic board. You can try cleaning the cognac off the board with isopropyl alcohol, that won’t hurt any of the components any more than they already are. You may be able to salvage the board with that but no guarantees. Its worked for me in the past with many liquid damaged machines.