cosmetic issue on solid cut fill

[kkmac]

Can't seem to get rid of the fine grey lines on walls when published/printed to pdf (see attached image). Switching 2D hardware acceleration OFF and ON again got rid of it in plan view and layout sheet view, but still on pdf! any other ideas?
Seems like a small issue, but when there is a pedantic client pointing this out on their marketing material, it becomes a serious problem.

[runxel]

It's just a matter of onscreen PDFs. If printed, you won't see them – because these "lines" are not really there.
That is a well known problem of Acrobat in particular, that fills, that are touching will bleed and some white-ish lines will appear.

There is one way to get rid of them, tho: Open the PDF in illustator and join all fills with the pathfinder.