Because I am not a customer of Inkjet Mall, I can't create an account on that forum. While I can read the messages I can't view the attached images.
I replaced the ink supply mechanism because I had a clogged channel. The Epson repair people I visited would not attempt to clean anything: they were only willing to replace parts.
I thought that I had created the clogs by not using the printer often enough. I now realize that regular printing and cleaning cycles weren't enough.