I have changed out the magenta imaging unit and the red dots have seemed to disapper, at least for now. However, the yellow is still fading to pink as shown above. I do not have a yellow imaging unit in stock right now, so I cannot replace it at this time.
Replace if you have one new the magenta unit.
Yes, you can swap them to see if your issue is moving to yellow.
Have you replaced the Drums ?
Here is a link just in case you need it
Have you replace the drum?
I have done the print calibration and it does not help.
It might not be the toners, it could be the drums.
Start with doing a print calibration to see if this helps.