Hate to necro this thread, but it's on topic, and updating my previous posts about loving this keyboard. I've been using it as my daily driver at work for more than a year now, and I still love it, but the "3" key on my numpad has stopped working, and the tales of RMA/repairs haven't been great with these keyboards from what I've read. Anyone have any suggestions? Thanks!
Check the warranty status, if you can. If it is still under warranty, opening it will void whatever warranty is left.
If you want to continue, open the case, locate the numpad 3 key under the PCB and, carefully, with the computer on and the keyboard connected, short out teh two pins with a length of wire.
If "3" starts appearing on the screen, you will need to replace the switch (desolder old, solder new).
If "3" does not appear, there are other problems.