Blured final edge of the objects - on Canon Imagepress C6000

[digitalro]

Hello,
Lately, we have been dealing with a malfunction which has not been fixed by the service and maintenance company to the date.
This consists in the fact that once the print is out, the objects and writing(texts) are more intense on the upper side of the direction of the printed paper(1) and rather pale,blured and not compact on the bottom of the direction of the printed paper (2).
photo:

We changed the magenta drum, the developer and we cleaned the sensors.

We use "resolution" for Printer Halftone setting.
Calibration,auto-gradation -every morning
1&2 Transfer roller - new
ITB Transfer - new

Has anybody dealt with such flaw, is there a solution to fix this?

thank you!

Victor

sample 2:

 

[the swift printer]

The only time i've seen a blurred edge like that, I had to do a manual gradation adjustment. This was occurring as the transfer belt wore out, any only happened when running color. The registrations and the the drums weren't aligning the way they should have, so i ran test sheets of each color, then manually adjusted the gradation. Hope this helps. These issues may be unrelated.