Hi Walker. - I’m having a similar issue with my 9900 where a single bar is missing in the PK channel. I’ve tried everything described above and the clog persists. Is leaving the print head parked over the piezoflush-soaked paper towel for a few minutes to soften the gunk a horrible idea? A fair amount of ink came off of the print head using the “shoeshine” method, but this one little bar seems especially stubborn.
Or if you have any other ideas I would appreciate hearing them.
Thanks, as always.
cjh