My 9890 with special addition ink is printing great for the last 4 years. When printing the VLM / shade 5 is starting to lose nozzles in the mid section of the head , cleaning will solve the issue but immediately after starting to print the head will lose nozzles in the same area almost immediately. To me it looks like ink starvation. Do you know of a way to check if the damper is to blame ?
In case I need to replace the dampers do you know of a good source to buy them ?