There are various "manual errata" threads etc on the shrapnel forum, possible copies elsewhere and some of the errata listed on the Dom3 wiki, but no concentrated effort that I know of to keep an accurate, up to date listing.
If you have the original document from the days when you wrote the manual, updating that would be the best possible thing, because then there would be no need to list errata as a separate appendix. The unit stats section though, good luck with that what with all the statfix changes, rebalancing and similar things done between versions 3.0 and 3.28.
If there is a possibility to update the entire document and export it to PDF, it would be awesome. And if it is possible, I'm willing to pitch in and help track down all the stuff that needs to be looked at.