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The cyan print head nozzles maybe blocked. Inkjet printers need to be used frequently to prevent ink drying out and blocking the print head nozzles. If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive. It may be more cost effective to buy a later model and better printer than replace the print head.
While printing,air pump pushing pressured air in to the cartridge bank to force ink out through ink tubes tubes..During this process any leak at the cartridge neck or blockage in cartridge needle causes leak. Remove all cartridges check two needles inside the ISS unit for each.. upper needle allows the ink flow in to the pipes and below needle pumping the air inside the cartridge bank..If any blockage in upper needle causes ink leak. My sincere advise to the users better replace ISS unit & stop printing for further damages..For Tech guys only: Remove ink supply station along with ink tubes out,gently detach both tubes(magenta), you can see the needle other end pump syringe alcohol with the help of syringe, do this process up to free flow.. once confirmed refix tubes back, ensure that no leak should not happen.. fix all back.. try...This advise purely professionals can perform.. others strongly cautioned.
I think you switched the ink stations. Try to switch the yellow and magenta. It also is a possibility that they are refilled with the wrong ink color. Place new ink cartridges and your problem is solved! (It can be that a few prints still show some pink color, because there is a residu of magenta in the yellow printhead)
You probably have a slowly worsening clog building up in the Magenta nozzles. It's also possible that your ink is reaching its end of life which, given the age of the C86 is entirely possible, especially if you are refilling or using a CIS sytem with your printer.
If it's a clog issue you can try soaking the parking pad with a mildly ammoniated cleaning solution (original Ammonia windex is good for this) or even distilled water. Leaving this with the printhead parked above it allows the solution to wick up into the nozzles and break down any clogs in the printhead.
If the problem is ink age though you will probably want to carry out the solution above AND replace your ink with a fresh solution. A CIS will need a thorough flush to remove any algae and cloggation residues before you use it again or you will just reintroduce the problem.
Can you confirm that you are using a CIS or non-HP cartridges with this printer?
It sounds a lot like the printhead has reached a clogging point where sediment has built up in the black portion and loosens enough to printer a few lines before it re-asserts itself again.
Based on my experience of this printer, if you're using a non-HP delivery system for ink then you should consider replacing the black ink with a dyebase alternative instead of pigment.. Replacing the Black/Yellow printhead and running a number of test prints to purge the pigment ink in the printhead should then result in a clean and more reliable printout in future.
One other vector for problems is the cleaning area and I've found that this can become soiled with excess ink causing cross contamination within the inks of one printhead. As yet I've not found a reliable solution to counter this sort of issue.
Hope this gives some clues and hopefully some ideas of a fix.
Without knowing what printer you have or what things you have tried I can only guess here. It sounds like you need a new cartridge. A color ink cartridge will have 3 colors of ink for most printers...cyan (blue), magenta (purplish-maroon), and yellow. Depending on what you print it is very possible that you could run out of one of the inks before the others. Printing green can be an indication that you are out of magenta ink. The cyan and yellow inks will combine and look green.
You can remove the cartridge and run a tissue over the printhead and see if you see all 3 colors as a quick test. If you only see cyan and yellow, then the magenta is probably empty or dried up. If you see all 3 colors I would reinsert the cartridge and try printing again. It is possible that the magenta was just clogged and you cleaned it with the tissue. If it still doesn't print all colors your best bet is probably to just get a new ink cartridge.