Sorry to bring up an old thread, but saw no reason to start a new one.
I just received a replacement for my K3 with fading keys.
Called yesterday and received it today. Now that's great service.
Successfully updated the firmware and added the books.
The power switch is not sticky.
I'm wondering if I should be worried that this replacement will also suffer from the problem of fading keys since its serial number is lower than the first one? I mentioned this to Carlos the CSR and he indicated that I'd just call and get a replacement. He also, indicated that I don't need to de-register the original one before sending it back. Does this sound right to you?