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I came across an article on ABS yellowing and remembered that this has been a question here. The solution, using 15% hydrogen peroxide may be worse than the disease though. If this info is already here, let me know and i'll delete this.

http://www.vintagecomputing.com/index.php/archives/189

You could try Retr0bright. I've used it before with success. It uses hydrogen peroxide but in lower concentrations.

http://retr0bright.wikispaces.com/