Thanks Dana, for getting back to me. I just took a closer look at the PK cartridge with Piezoflush. The level appears to have dropped slightly, and the exit chamber now looks 1/2 to 2/3 full.
When I did a manual cleaning, I used the instructions in your video. I let the printheads sit on a paper towel wetted with Piezoflush, for over an hour, while I cleaned the capping station, wiper blade, and the foam area on the far left. I paid particular attention to the wiper blade, as I originally suspected that to be the problem. I have done this at least three times, as the problem has failed to go away.
This all seemed to start, back around the end of Summer. I had not used the printer in almost two weeks. And, the nozzle check had shown gaps in the PK. Oddly, all of the missing nozzles were together in a group, in the center of the PK pattern (which, eventually caused me to suspect the wiper blade). A simple head cleaning cured the problem. But, that same pattern of "clogged" nozzles has kept reappearing, ever since. I have tried to post a scan of a recent PK check pattern. Oddly,if the printer sat idle for a week, the nozzle check would be good. But, if I made another check, just an hour later, I would get that same bad pattern.
Then, around the first week of December, I began to get black drips on my prints. The first print of the day, would come out fine. But, the second one (and every one after) would have black drips of ink. I would then do a nozzle check, and find that same group of black nozzles clogged, once again. I tried manual cleanings. But, the problem persisted. Could the damper be clogged? (the dampers on the R3000 are not replaceable)
Unfortunately, I am not able to do any of the checks, that you suggested. The printer is now totally disabled, thanks to the faulty cyan cart. I can't do any nozzle checks, head cleanings, or ink switching. The error message reads: "Printer does not recognize the following cartridges:". And, there is a big red 'X' through the cyan. I have tried powering down the printer, unplugging it for several minutes, and restarting it. I also removed the cartridge and reinserted it. I even took out the cartridge, while the printer was off, restarted the printer, and reinserted the cartridge, when the printer noticed that it was missing. Nothing has worked. Oddly, this happened, right in the middle of a cleaning cycle. And, it is an Epson cartridge that is 3/4 full.