Bizhub C220 cyan color registration shift on one side after black drum replace

[Theophilos]

Please be patient with me. It's my first post here and I'm just a happy owner/user of a second hand bizhub C220.
All the units and consumables were still under their end of life, except the black drum unit.

I replaced the the black drum unit and a shift in the Cyan color appeared on a side of the page. Putting back the old black drum unit did not fix the issue.

I tried looking in the color registration menu, but all changes there are on a page level, not for just one side.

I don't know where the IDC sensor is located or what I could clean/change. Google and forum search didn't get me to any results so far. Could you help me with some ideas? I don't want to waste your time.

Cyan shift.jpg

I attached a jpeg and pdf of a scanned print.

Drum Unit Status Start Date End of Life Forecast.
Cyan 60% 29/5/2012 16/9/2026
Magenta 60% 29/5/2012 16/9/2026
Yellow 60% 29/5/2012 16/9/2026
Black 1% 17/11/2020
Developing Unit Status Start Date End of Life Forecast.
Cyan 27% 29/5/2012
Magenta 27% 29/5/2012
Yellow 27% 29/5/2012
Black 22% 29/5/2012
Consumables Status Start Date End of Life Forecast.
Ozone Filter 37% 29/5/2012 8/8/2035
Fusing Unit 24% 29/5/2012
Image Transfer Belt Unit 44% 29/5/2012 29/11/2031
Transfer Roller Unit 37% 29/5/2012 8/8/2035