C8000 - CMYK lines on trailing edge

[dagoof]

I've got an issue with a C8000 leaving CMYK stripes on the trailing edge - could anyone advise what unit that would give that effect?
I thought it may have been the registration roller needing cleaned (before 2nd transfer) but have tried that. Have also tried swapping out both 2nd transfer unit and main transfer belt unit.

[khattab.al.masry]

I've got an issue with a C8000 leaving CMYK stripes on the trailing edge - I've managed to narrow it down to the transfer belt assembly, could anyone advise what might be the specific cause within this unit that would give that effect?

Samples please!

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[dagoof]

Spoke to soon - I'd swapped out the transfer unit and thought that was it gone but it's intermittent and back again!

Sometimes it leaves clean straight lines, but other times it's dirty splodges (see attached).

[sadanand]

Check image magnification and image registration

[dagoof]

Had already given top-side registration rollers a clean to no avail, so I just pulled out the whole unit and gave it an overhaul, that sorted it