There are 6 keys in my MacBook Pro that are not working, how can I fix them?

I am experiencing issues with 6 keys (6, y, h, n, =, /) on my very old MacBook Pro, when I boot up my laptop these keys just dont work anymore.
But when I used the keyboard viewer it works, can anybody help me or guide me on how I can resolve my problem?
Big thanks!

Hey PurplejinG,
Thanks for the question. After reviewing your post, it sounds like the keyboard keys are not working correctly. I would recommend that you follow these articles, they may be able to help you resolve or isolate this issue.
One or more keys on the keyboard do not respond
http://support.apple.com/kb/TS1381
OS X Mavericks: If keys on your keyboard don’t work
http://support.apple.com/kb/PH13809
Thanks for using Apple Support Communities.
Have a nice day,
Mario

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There are 6 keys in my MacBook Pro that are not working, how can I fix them?

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