Quick question. I've had a head management sensor which I thought was related to a bad printhead. I replaced the left printhead first to see if it would resolve the issue. I ran a nozzle check from the Service menu which produced the following print:

https://www.dropbox.com/s/vbd94p02a0..._2953.JPG?dl=0

After I replaced the head, I got the exact same printout with the same areas missing. What could cause this? How would the same nozzles not be firing on a brand new printhead?