Success!! I wanted to let you know that I got my Yellow printing issue resolved. I did not have to do small format print head cleaning kit the you mentioned.
I did purchased and downloaded the full Epson r3000 manual and service adjustment program from 2manuals.com.(At first I tried the free WIC Reset Utility and the charge system in it, but this did not work).
Although the manual and service adjustment program is a window’s only program it is very comprehensive, well worth the $32.00
So in the service adjustment program I did the head cleaning utility and then the full charge utility. After that I did a nozzle test print and all the colors printed good. (Although the full charge utility uses up a chunk of ink out of all the colors, it was the ticket for getting the air out of the yellow line.)
So now everything is working and I would caution all uses of your refillable cartridges to be very diligent and always check the ink levels in their cartridges, and not trust what shows on the printer.
Thanks for your time…