I have it working and it was easier than I thought it would be.
I did not get a chance to read your reply until Friday afternoon and the PiezoFlush and carts had already been shipped. I ordered a head cleaning kit and a new ink selector from Compass Micro just in case. Saturday I went ahead and installed the flush carts in the MK & PK positions before I left town. When I got back Monday it was still not working. Today I called to see when the head cleaning kit would be here and found out it didn't get shipped due to your warehouse change.
I decided to go ahead and install the new ink selector which came in today. To do that I knew I was going to need the Epson Maintenance program.
Since I am almost all Mac I had to drag out an old PC and hook it up to get to the Epson Maintenance Program. I looked around in the program to see if there was anything to try as a last chance before I replaced the ink selector. I got into it and decided to try a level 3 head cleaning on the problem head. Printed a nozzle check and was surprised to find about half the nozzles working on it. Ran a couple of more level 2 cleanings on it and some other heads and now have a perfect nozzle check print.
I have created a home next to the 4900 for the PC so it can stay connected to the printer if needed in the future.
I have a new in the box ink selector if anyone wants to buy it since it is non-returnable. Make me an offer, new they are $191.70 from Compass Micro.
Hope you are feeling better.
Thanks for all your help.