Ricoh 2090 Streaking Problem

[Emtri]

We have a 2090 machine, which up untill recently has been running pretty well.
We've had a tech in now for streaks across the upper portion of the page, lead to trail.
First 100-200 copies or so are fine and then it starts to streak. problem always comes back after tech leaves maybe a few thousand copies later.

Has anybody had a similar situation?

[msaeger]

Gotta sample?