Missing component when saving as a dxf file

When I save the following file as a dxf, the layer “seat cushion” and its components disappear. Anyone know why?

manufacturer drawing.3dm (2.4 MB)

When I used SaveAs and the default export scheme, Rhino warned me one object was skipped and said to look at command history (F2).
I did and saw one BREP was skipped.

I ran SelBadObjects and the seat cushion was selected.
https://wiki.mcneel.com/rhino/badobjects

It looks like the best fix will be cleaning up the modeling for the top curved surfaces for that object. Eliminate the tiny surfaces and make a single surface that fits better.

Ok, I’ll see if I can find out why it’s a bad object. Thank you John.