Importing a completely connected .dxf drawing from autocad, but comsol keeps telling me it's disconnected and has 15 components...is there any function that will show me where the disconnects are so I can repair them, or some other solution?

I attached the dxf file as a zip folder (wouldn't let me attach the dxf directly) if anyone would like to examine it. Upon importing, comsol tells me "Finalized geometry is disconnected and has 15 components." I have tried all three import options--form solids, knit curves, and do not knit curves. I've also tried playing around with the relative repair tolerance with no effect. In autocad, when I go to hatch the object the hatch pattern stays fully confined, so there doesn't seem to be any breaks that I can tell. Thanks for any assistance!