Strange gray lines in rendered PDFs, driving me nuts!

I printed an Illustrator file to High Quality PDF but various gray lines seem to show up - primarily around text it would appear. Here is an image scrteen shot of the resultant PDF and the lines (rogue lines surrounded by red boxes):
http:\\207.234.221.182\lines.jpg
Any thoughts?

This comes up from time to time, but I don't recall that there is single identified cause and/or fix.
Can you post a sample file that demonstrates this problem? (Zip all files; include linked images or embed them.)
Please state your Illustrator version.
Also, if you want your URLs to appear as links here, use forward (instead of backward) slashes, like so:
http://207.234.221.182/lines.jpg

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Strange gray lines in rendered PDFs, driving me nuts!

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