Help Part of Touch Screen Not Working

I'm having problems with my Transformer Prime. A bar going horizontally across the screen about 1 inch from the bottom and about an inch thick does not respond to touch. I had to replace the board for the touch screen because of the battery swelling and breaking it. I have done a factory restore, but it did not resolve the problem. I have reconnected everything several times, but I suspect the ribbon from the digitizer must be damaged. If someone else has suggestions, I would appreciate it.