I am trying to find open contours in my sketch, so I can then extrude it.  Is there a magnirier or other feature in Solidworks that will point to where these contours or open?  I've zoomed in on the sketch, but I still can't find where they are open.  I've had this problem many times before and I am hoping there is a easier way than to zoom in on every line, especially when I have a tourtuos profile.

The sketch in question is Sketch 27, at the very bottom of the tree.  My intent is to extude tha sketch to provide a "backing" for the other extrusions in the part. Once this is extruded (not a thin extrude) I can send the part to a 3D printer for a co-workers daughter.

Thanks,

Bill