Certain keys not working on my Macbook Pro

recently the return, right shift and backslash-question mark key do not work on my macbook pro. I don't believe there was any damage from spills or other physical reasons. I took off the key cover and cleaned it with air but it didn't help. Does anyone know if there is a solution to fix this or is just something I will have to take in for repair.

Hi, Try reading this and see if it helps you out:
http://support.apple.com/kb/TS1381

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