Some Keys stopped working on my Macbook pro (mid 2012). Can someone help me please?

Hi
So keys 1,2,3,4 stopped working. All other keys are working fine. I tried doing some troubleshooting myself but none worked. As far as I can see the keys do not light up on the on screen keyboard when pressed. Do you know of any troubleshooting I can try to fix this problem.
Please note there was no spillage or any abuse to the keys what so ever. The keys just decided to stop on their own. Any help is appreciated.
Thanks

One or more keys on the keyboard do not respond
OS X Mountain Lion: If keys on your keyboard don’t work

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