If its happening on multiple prints it could be the ibt belt or the mob sensor.
Have a tech run Regicon. It could also need a new config chip.
I am experiencing similar color shifts. I have the most recent firmware 5.2.1 but it did not help nor did the new options. I have included a scanned in sample of the issue
I replaced the imaging processor board part 960K34661 after the first attempt at a firmware update failed. This color issue continued. I have reseated the imaging units, toner, and fuser with no change.
Thank you for any assistence you can give.
seems a registration issue , you can try this :