Filter to select all yellow entities

Hello,

I import large .dwg files that have many yellow entities (typically hidden lines).  These do not display well as PDF with a white backgroud - I want to globally change them to a different color.  I have been trying to use smartselect to filter but it is not working - it seems that blocks with multiple colors are ignored.

Can anyone offer advice on how to configure the filters so that everyting yellow is selected for color change?

Thanks,
Bob