Canon won't honor their warranty on a defective print head. I will never recommend Prograf wide format equipment and the Canon service (lack of) behind it. Time to move on.
Apprentice??? I have been on Prografs since the 8400, I repaired them when service techs could not. Cap assemblies, motherboard replacement, broken gears (that Canon would not sell us), clogged lower ink tanks- been there. 35 years making prints, dig...