They all the a "5" in common. Look at your switch matrix in the manual, look for the "5" wire color and other switches it goes to, then look for a broken wire.
Check the moving harness with the book case for a broken wire too. Could be broken inside the casing where you can't see it. Did you remove the top of the book case ? I'd start there, maybe broken wire/solder joint.
LTG : )