I would say buy a new board and ebay that to someone who does repairs.

It is fixable, but unless you have a lot of experience you could do more damage then good.

Even once you fix it there is still a chance that you didn't catch everything. If you don't it will eventually fail again.

You have more acid damage then just that one burnt chip. U16 and U20 both have acid damage. The resistors around them have acid damage.

Not sure what techs charge around you but around here the cheapest I know is 40 an hour. Do the math to decide at what point a newer more reliable board is worth it.

I would suggest if you want to learn how to do board repair, buy a cheap game. I cannot see him screwing up the too much by working on the cpu board, but I have seen people fix things on one board, only to have it fry something elsewhere.