Touch screen not responding

When my Asus Zenpad S 8.0 Z580C is in portrait mode the section of my screen where my home and back buttons are does not respond to touch. The same is true no matter how i orient the tablet, that small portion of the screen doesn't work. It displays fine, but it's like the touch sensor broke. Does anyone know who I might fix this with out sending it to Asus and spend $230 to repair a tablet i can get for $125 retail.

Thanks,

Adam