If that was normal:
1. All 4 would do it
2. Xerox's market share would tank
3. This forum would have daily complaints of the ghosting
So since we know it isn't normal and since the certified tech came there and said it can't be fixed, then call your Sales rep/Dealer.
And it is also the same distance for the fuser, and appears to happen in more than one color, so that eliminates the drum as being the defect (Unless you are neglecting to mention that it only occurred on one or 2 of the CMY pages) and shows the fuser was the issue since it applies (fuses) all the colors to the page.
The distance is 95mm, which is exactly diameter of the drum, but they are changed!
As admin go to Machine Status > Tools > Troubleshooting > Support Pages > Print
Follow the directions and repeat back the results if needed.
Here is the problem!!!
It decreases on low resolution! BUT colors became different!
It should be zoomed to see it.
Drums a 70-90% life, but I changed them.No changes!
We have a WC7830 wich repeat white colored text at red(Bordo) background as negative black text. Infact it repeat everything white object as negative, inside the bordo background.
Tomorrow I will post the image here, but if anyone have any idea please help !