Toshiba 451c smudge - smears only on Magenta and Cyan

[gideon]

Front side copy has smudge - smears lines, only on magenta and cyan only at the front side of LT copy , black and yellow are perfect clean copies.
Checked M and Y developer units and mags, they are normal, can't see anything wrong with them. I replace on this copier drum, blades, transfer belt and roller. Machine has 240K, I just started working on this one a month ago. Any idea? Thanks.

[ToshibaTech]

Is there any play in the revolver?

[gideon]

Can't see or feel any play with the revolver.
I switch between the Yellow and the Magenta developer units, the magenta copies (in the yellow dev. position) were fine, the Yellow copies (now in the magenta dev. position) smeared. So the problem is probably in the revolver? Did you ever had to replace it? Any other idea? Thanks