Mike-I have a P800 which I haven't used in many months. I have problem which is nothing is printing for the yellow cartridge. Not  a single dot. I have tried your unclog program didn't help. Tried the builtin program heavy cleaning 3 times with a new cartridge but still no yellow dots. Anything else I can try or does it have to go back to Epson. I'm getting too old to wait for Epson to fix it. I assume its somewhere in the tube that goes from the cartridge to the printhead.

Jeff Jessee