Frustrating.
Hello,
I am having a very similar problem , the esc key all the way across to the eject key stopped working on my mac book pro last night; when pressed an alert sound plays and sometimes the keyboard will light up.
As with you, no spillages, although I did recently remove and reattach the return key as a small piece of plastic slipped under and prevented it from functioning. However, the return key is functioning perfectly so I am skeptical that it could be related.
I was wondering if you had made any progress with the issue?
Thanks,
Stacey.