I googled a bit for "foam 3010 drum" and apparently people were in same problem:
http://www.largeformatphotography.in.../t-116560.html
the one before the last reply just answers my question!
I also found an image with same nasty bubble pattern: http://www.apug.org/forum/index.php?...or-base.50783/. interesting that foam leaves traces on overexposed areas. It is understandable, as at lower density areas entire latent density is revealed during development, while bubble edges, stuck constantly at high density areas, cause over-development underneath.
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