Keyboard malfunctioning

Hi guys, I've got a question for all of you.

My Macbook Pro keyboard is acting up. I cannot get the "r", "4", or the volume down button to work. The only way that I am able to type this is by copying and pasting the letters in. Are there any troubleshooting tips that i can try, or do I just need to take it in to have it serviced? I bought it back in late July, and it is a 15" 2.2 Macbook Pro. Thanks.

 

Yes, I have installed all of the updates.

But there is more to this story than I originally thought. Apparently, while I was at work, my girlfriend was using the computer. She sat it down on the floor for a second while she got up to get something. My dog then knocked a cup with a small amount of water over onto it. I do not know how much water was spilled. She said that she wiped as much of it up as possible. Everything else is working just fine. So hopefully it only damaged those keys and the only thing that will need replacing is the keyboard. The computer was left running while all this was happening. It never shut off, and nothing else appears to be wrong. Hopefully, I dodged a cannon ball here.

All other keys work fine. The backlight comes on behind all keys (even those not registering presses). I popped the caps off of many of the keys around the malfunctioning ones and everything looks dry and good. And for some reason, every so often the input font switches. I think this has to do with the malfunctioning keyboard as well.

So what is everyone's thoughts on this? Do you think that everything would be ok if I replaced the keyboard? How difficult is it to do this? I have seen the guide on ifixit.com, but are there any others that I can look at as well?

Thanks.

 

Anybody? Do you think that replacing the keyboard should fix my problem?

I can get a replacement keyboard for about $60. I tried taking the MBP apart this afternoon, and I was successful in completely removing the keyboard and putting it all back together. So I know that I can do this repair myself now. But do all of you think that this should solve my problem?

I just noticed today that my LEDs behind the keyboard have dimmed significantly on each side of the keyboard. The ones (it actually appears to be only one) in the middle are just fine.

Thanks.