Spilled tea on my MacBook and now Airport Card isn't reading?

About three days ago, I spilt tea on my 13" Macbook. It got all over the keyboard so I immediately flipped it over and shut it down.

I proceeded to check Google through my desktop computer and see if I could do anything, and someone had posted an iFixit guide on how to take apart the Macbook so I could dry it off. I took out the battery and the trackpad and wiped both off, then proceeded to dab at any wet parts on the logic board and elsewhere.

I managed to reassemble everything, and then turned on the computer, which seemed as good as new. Only there was one problem: it claims that my Airport Card is not installed.

I'm fairly confident it's a hardware issue as I had given it to a friend who reset the SMC, PRAM, and a bunch of other things -- he also thinks it's most likely a hardware issue.

My question is this: Am I only going to need to replace the Airport Card (if it is damaged) or is there a chance that the liquid has damaged the logic board and now it's unable to read the Airport Card? Any thoughts or help would be appreciated.