Maybe I should ask a techy, but this group seems informed so why not.

The bottom row of my right membrane panel ( the last row of preset buttons) doesn't respond anymore, and currently I'm trying to permanently repair and strengthen the ribbon cables. 

I want to figure out which cable is the faulty one though, are the two ribbons on the right side (at the bottom of the right panel) the one's responsible for controlling the preset buttons, or is it the two ribbons coming in and entering from the left side? If there are any technicians or DIYers that know the answer I'd really appreciate it.