Dots and dirt patches same spots

[GabiE-Xerox]

Hi,

First try to swap the drums between them (they all 4 are interchangeable). 

Gabi

[Keshara2032]

I recently bought a used Xerox WorkCentre 7530 and i noticed there are magenta dots on the corner of the page only when using A3 and cyan dots very small yet over the page on the same spots. I also noitced there is sort of a faded patch ( not a smudge ) on the same exact place. Please help me