Strange problem with MacBook's keyboard

First of all, I have to say that as you may see I'm new here, MacRumors is a great webpage.

I appreciate in advance for taking the time to read my problem and help me to solve it.

Im from Argentina, so my English is not that good.

I have a really strange issue with my macbook's keyboard. A week ago, I spilled a lot of water all over my macbook. I searched internet, so I unplugged the machine, took out the battery, etcetera, etcetera. Today the mac is working just ok, thank god.

A few hours ago, I noticed that the following combinations of keys wasn't working, Right ALT + ´ this combination as you know returns the character {

So I thought that the water broke any of those keys, but I can use the Right ALT with other keys to make other characters like @ or #, and the other key works as well.

So I googled the issue hoping to find someone who has the same issue or similar, I tried some things (software related with a text-to-speech setting) but nothing seems to change.

I wanted to ask here before taking it to the apple technical support.

Thanks in advance!

PD: My macbook pro is mid 2010