Convert color PDF to Black in Acrobat 9

I have need that I have not been able to find an answer to. I have a fairly large color pdf (over 400 pages of drawings in color) and I would like to turn all the colors to black. Everything I have been able find in my research to do this has to do with converting a color PDF to black & white (grayscale), I do not want to use grayscale, I need the colors to be converted to black. Any color other than white I want to be black. I realize that you can print to black and white but that will not work for me because there are a couple of pages in the PDF that are color models that I will reinsert back in to the PDF after I have converted the PDF.
If anyone can help in this endeavor it would be greatly appreciated. 

For Acrobat 9 Pro it is:
File > Export > PDF/A
Be well...

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