How do I clear the printers?

I don't know if this is a Hercules problem or an MVS problem, but since it's keeping me from shutting MVS down cleanly, I'll ask it here...

How exactly do I go about clearing out the printers? JES2 is refusing to shutdown because of this:

00-           $du,started                    
              $HASP000 PRINTER1  00E DRAINING
              $HASP000 PRINTER2  00F DRAINING
I've heard of this problem with the card reader and know how to fix that, but nothing I've seen online indicates this should be a problem with the printer. How do I fix this so that I don't risk damaging my MVS image by closing Hercules without completing the shutdown.

Mike