Have you accepted all the tracked changes? Do your new headings have the Heading 3 Style applied? If so, hyperlink to the new headings via Insert|Hyperlink>Place in this document.

Once you correct the path for one such hyperlink, you should be able to use Find/Replace to correct all other hyperlinks referencing the same location. To do that without first deleting the faulty old hyperlink you're replacing, press Alt-F9 to expose the field codes in the document. Use the faulty old hyperlink's destination for the Find text and the new one for the Replace text. Press Alt-F9 again, then Ctrl-A, F9 when you're done, then delete what is now the duplicate hyperlink.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]