I would recommend starting with using the Simple Image Quality Adjustment Tools.
Hi, I have a new PrimeLink C9070 and I am having a problem with the image quality in image areas that have blue or cyan hue in it. In those colors brighter 'spots' seem to appear and the color is very inconsistent. Any idea what could be the problem and how to solve it please? Thank you
EDIT: The thicker the stock is the more visible this gets. On image it's 270gsm - set to Heavyweight 4 (highest setting). Also visible on 148gsm papers with appropriate setting, just not as much.