Lines in right sidebar menu

Just updated to RestImpo Premium theme and I now have what appears to be an underline (mostly obscurred) on the social icons in my right sidebar.

http://onyx.fire-house.net/wordpress/

Wasn’t there until I swapped themes. I’ve been through the theme color settings trying to find it with no success. In the html for that sidebar I’ve added “border=0” to the images, no change.

Thanks