Is this a burn on the logic board?

We spilled a margarita on the keyboard. Turned it off and turned it upside down on a towel (lid open) for a few days. Took the back off and it was dry - saw what looked like a burn mark on one of the cable protectors. Took it to a repair guy who turned it on. Worked but keyboard didn't. Took it home and tried to turn it on again and didn't work.

I just took the laptop apart and on the logic board under the signed cable cover it looks signed. The silver squares are brown and I found sticky residue on the two cables. I wanted to know if it's worth trying to replace the keyboard or is the logic board dead. I'm attaching a picture of the logic board. Thanks

https://m.flickr.com/#/photos/62898330@N...