I have a Epson 9890 and have been battling two nozzle head clogs. One on LK and the other LLK. See attached file 1. I’ve followed your video(beautifully done Dana) on cleaning the capping station, the wiper blade and flushing box, and bottom of the print head(many times) with no change in the nozzle test print. I purchased the replacement cartridges and put the PiezoFlush in the LK, LLK, and PK (because I was low on ink at the time). Did the INIT Fill in service mode and let it set for several days. Did 3 clean cycles and I printed nozzle test and see the red now in LK, LLK, and PK. See attached file 2. Still clogged. Ugh! I decided to print large boxes of light black (RGB 128) and light light black (RGB 198), with a strip of Black. I did this as least 10 time on large 17x22 glossy paper and much to my surprise the LK and LLK boxes printed not red but gray and light gray with no banded at all everytime. The strip of black printed red as I expected. Where does the light black come from if the lines to the damper show full of PiezoFlush? Why is there no banding? Why does it not print red? Thanks for your time!