Can't Find AddThis Code Within Our Website

At some point, our website, Wellbuzz.com, had two profile ids for AddThis added to it. I am trying to remove the following profile id from our code as you can only have once publisher Id per page.

<script type="text/javascript" src="https://s7.addthis.com/js/300/addthis_widget.js#pubid=ra-558ac14e7f79bff7"></script>

When I view the source of a page on WellBuzz.com (such as the home page), you can find that code on the page. However, I can't figure out where it is being added and how to remove it. Can you please let me know where I can remove this from? If it helps, I am granting wpmu support access via the dashboard.

Thanks for your help!