WMS LiDAR image will not plot

I'm referencing in a WMS image (a momochrome LiDAR image) which shows fine on the screen.  However when I plot, the image won't -- all other aspects of the drawing come through.  It's not on a non-printing layer.  I've fiddled with RASTERPERCENT, RASTERTHRESHOLD, and the plotter properties (currently using a PDF plotter but I have tried others with no success) but can't get  the image to come through.  Adding to the frustration, other images on the same server (i.e. color aerial) come through and plot without issue.  Any ideas why this particular image won't plot?  According to the WMS administrator, there is nothing on their end that "locks" the image prevening it from plotting.

C3D 2014

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