Thank you Mr. LGebhardt for your thoughtful response. And thank you too, Walker. I don't know if in fact AutoCleaning is on. I never knowingly had AutoClean on for any reason. I'm not sure where it is set on the 7900.
I referred to InkJet Mall's video on maintaining and cleaning the print head and so have done the following: Capping station cleaning, Flushing Box cleaning, Wiper Blade was replaced, and the bottom of Print head cleaned with Peizoflush. I also did basic cleaning, and cleaned in pairs, both in the regular and in the service modes, specifically for Cyan, which did not change. I never did the SS cleaning.
I'm not going to convert this machine into a B/W printer. I would like to get it back to full functionality, if at all possible.
Do you think a flushing with Peizoflush cartridges will do the trick at this point, Walker?
Would changing the head solve the issue?