Hello colleagues, can you help me a couple of months ago I bought a used HP LATEX 360, I put all the new printheads, I currently have a problem with the C / K head, suddenly the Black color / head started to leave lines, I did a lot of cleaning but it's still also, then I took out the head and cleaned it by hand, but before cleaning I did the Test plot and the black color did not come out of 1 head, when I cleaned it by hand a couple of times the color started to return and later worked normally, I printed a couple of squares and again the same thing started to happen, I have a feeling like the color isn’t coming to my head. A little more than 1.5L went through my head, I could help