CM1312nfi: white vertical lines out of nowhere

I've been using this printer happily for the past few months without a single problem. I use this printer mainly to print full page full color images on special glossy paper that requires a higher fuser temparature so I had set up one of the paper types to use a higher fuser temperature. Quality has always been incredibly good but that ended abruptly today.
Today I printed another full page, full color image but noticed a small vertical white line at the top. It was about an inch long and my guess was it was about a single dot wide - like something scratched the print.So I printed the same image again. This time, the whole print was filled with these "scratches", most running from top to bottom and all not wider than a single dot. As these "scratches" were visible on all colors, it isn't something like a failing toner cartridge.
When I print on normal paper, I don't see these lines but since the print quality is much lower on normal paper, they might be there but perhaps I simply don't see them.
I've spent 2 hours on the phone with HP support (@ 5ct/min) but they just tell you to do the standard things, like print a Configuration Report, do a few calibrations, clean a few times, etc. In the end I was no further except that I wasted about 50 sheets of that special paper (@$1.50 per sheet!).
Since then, I've printed a few more times and although there are now less scratches than before, it's still there. If I look at the print, I have the feeling it uses less toner than normally. Also, if I print two copies of the same print, the second copy is usually a lot better than the first print (probably because the fuser has a higer temperature with the second print).
Here is a (close up) scan of a print-out with the problem:
http://www.whutever.com/privateimages/HPLines.jpg
What could be the problem? Failing fuser? Dust? Something else?
Edit: Wanted to add that the white vertical lines appear in different places each print.
Message Edited by CliffP on 04-29-2009 12:03 PM

Did you ever resolve. I am having the same issue

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