Apple wired keyboard - certain keys not working with shift

I treated myself to a new Apple wired keyboard MB110B/A for my mac mini.
My previous keyboard worked fine, however the new keyboard causes the computer to enter the Hardware Test mode every time the computer is restarted. The computer only starts normally without the keyboard connected (or with my old keyboard connected).
Once the computer has started, if I plug the new keyboard in, it appears to work normally with the following exceptions. The following keys do not register when the "shift" key is pressed: 2, w, s, x. This fault does not occur with my old keyboard.
As these keys are in a line, I think there may be a wiring fault inside the keyboard. If so, would this explain the computer entering Hardware Test mode every time it is started with the keyboard connected?
Thanks in advance.

Definitely sounds like a hardware fault in the keyboard to me. I assume it's the same whichever USB port it's connected to? (and if you plug it into another Mac, too)?
Of course, as that keyboard is glued together in final assembly, it's completely unrepairable.
If it's a reproducible fault (and new anyway): take/send it back for replacement. You shouldn't have any trouble with Apple arguing.

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