Josh715M post worked for me as I have the same phone and product number.
http://forums.windowscentral.com/nokia-lumia-820/249355-touch-not-working-after-amber-update-replaced-digitizer.html
Variant ID : 7224985975
Varian Name : RM-824 NDT AMERICA US ATT
Product Code : 059M0F3
Software Version ...