That is what I tried initially and didn't have any luck. I tried updating this line with the updated website:
<url><![CDATA[http://gis1.usgs.gov/arcgis/rest/services/gap/PADUS_Owner/MapServer/tile/{z}/{y}/{x}]]></url>
<url><![CDATA[http://gis1.usgs.gov/arcgis/rest/services/gap/PADUS_Owner/MapServer/tile/{z}/{y}/{x}]]></url>