Two letter-keys suddenly behaving strange

Please help! i've looked all over the web, but cannot seem to find anyone with the similar problem. Ok, here's the dealio:
Two months ago I bought a used mid-2011 Macbook Air (13" / 4gb /128 gb) for my girlfriend. Everything has worked fine and we/she has been very happy with it. But then, a couple of days ago, she tells me that the key for the letter 'B' suddenly has stopped working. Please note that the mac has never left our house, it has been sitting on the couch all the time (where she does her surfing), nothing has been spilled on it and nothing out of the ordinary has happened, neither software- or hardware-wise.
I found this very odd, and preceeded to investigate. After a while I also notice that the key for the norwegian letter 'Å' (the key next to the letter P) is also not working. At first I am dreading that the keys have "died" and I have to get an expensive keyboard repair. But then I opened Keyboard viewer, and to my relief I see that both keys are actually responsive, but when I press the disfunctional letter keys the Command-keys also get highlighted in the Keyboard viewer. I was thinking; "Hmm.. Very strange, but this can probably be fixed" but apparently it's not that easy..
I have done all the troubleshooting I can come across, nothing works! So tonight I got to the last resort: Format the HD and do a clean install of OSX..
STILL THE SAME!! Arrrgh
So please, does anyone have any clue to what is going on?
I might add that the keys are working with external keyboards, so it's probably something with the hardware on the macbook.
And even if this actually is a faulty keyboard or something, how can this happen totally out of the blue?? How can two keys all of a sudden get "connected" to the command-keys? (Command-keys are working as normal, btw..)
Any tips before I send it to repair?
Thanks in advance for any suggestions, and please excuse my english
Cheers,
TheUlser

Try an external keyboard. If it works ok, the internal one is most likely damaged and needs repair.

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