After doing some online research I found what at first seemed a little too
simple a way to clean the print heads on my Epson printer. Essentially you
take a small folded wad of tissue (I used some heavier shop towels), soak in
hot water and place this on the ink pads where the print heads sit when the
carriage is at rest. You do need to initiate an ink tank replacement cycle
to get the carriage out of the way.
I did the above cleaning twice last night and the banding issue is almost
completely gone. I will likely run this process at least once more and
then, after replacing the now low yellow tank, I will also run a normal
cleaning cycle on the printer too.
Now all I need to do is rescan all the negatives that I trashed the digital
files for thinking there was a problem with the files.