keys right above disk drive not working

There is no liquid damage to my macbook pro and out of nowhere some of the keys right above my disk drive such as "L" "O" and "M" stopped working.

I want to know waht my options are and what exactly I could do to maybe fix the problem on my own. The rest of my computer is working great, its just a few keys. It started with one key, and now there are three that don't work. I don't want it to completely break but I am kind of strapped for money so the cheaper the better.