Key doesn't play - Korg XC-3000if

One key on my Korg XC-3000if doesn’t make a sound when it is played. All the other keys are fine.

I have been researching online and I suspect that the problem is a bad contact strip. Is that the probable problem? Are there other possibilities I should investigate?

If the contact strip is the problem, then I need to pick a replacement part. Syntaur lists 4, 8, and 12 note contact strips. Which part do I need for my piano?

Finally, I watched a video where a man replaced a contact strip on a portable keyboard that was easy to take apart. Is it possible for me to replace a concert strip on my console style piano?

Thanks,

David