To those people who are willing to pay $800 dollars amount of money to fix it.
Come on is that sounds cheap for you? I'm just saying that they should at least check up diagnose and fix the only parts that are broken.
What you are failing to recognize is that ALL of the damage may not yet have manifested itself. Milk contains sugars that can cause corrosion later, and leaving any kind of residue on the electronics creates a ticking time bomb. Replacing the batteries may fix the issue and get you running again or it may not. But please understand that even if replacing the batteries does get you running again, it is a matter of time before the next component fails.
And don't be a true delta bravo and try to return the screwdriver set that you bought and used. That's just wrong.