How to fix laptop keyboard-some keys not working?

I have a 3.5 year old Toshiba Satellite. Suddenly my F,W, H and Q keys are not working. I took it to "geek squad" who tested, and said the issue is definitely the keyboard. I currently have an external keyboard plugged in, but that won't really work in the long run (as I often take the laptop with me, etc). Is there and easy way to fix this (or a good site I should check)?