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Normally I dont zombie old threads, however.....
Just finished fixing/replacing my 17-85 aperture. I thought it would be helpful to have all links related to fixing this problem.
But...all of the above methods involve removing the front element assembly, which is not necessary. That method involves being careful to reassemble for proper focusing alignment.
Heres the method I used...
Using the above method, it took me a little more than an hour. Not bad for someone thats never disassembled an AF lens before, and no worries about focus alignment.
I will try to convert that page into a PDF file to host on my dropbox, should the link ever go dead.