CP 1000 Banding when Printing Magenta

[fbkhan3]

Hi guys

I'm having trouble with strong Magenta banding in feed direction and only visible when printing Magenta.(sample attached)

Things Checked.

Transfer Belt.
2ndry Transfer
Fuser Belt
Magenta DV bush Roller

Things swapped.

Magenta Drum Unit
Charger

only 1,40,000 clicks on this unit. Kindly need your valuable advise to escalate the issue.

Regard's