I recently got some piezo flush and cleaned out my nozzles, my R2400 hasn't printed seriously in a few months and it's developed some pretty crazy clogs. The piezo flush worked well, but the cyan, magenta, and yellow are completely blocked. I even took out the cartridge tray and cleaned it, and the part at the bottom that has a metal cage screwed to it. After all this I installed the carts, and ran a nozzle check followed by 3 head cleanings. The Cyan has a few blank lines, but magenta and yellow have the middle part of the check missing. Can anyone suggest what to do further?