What is your definition of a working cross-reference? If it points at a non-existent bookmark then the xRef will return an Error message in the document. If the bookmark has expanded because of someone pasting content at the start of a bookmark then it can be much harder to spot unless it is now displaying a '0' paragraph number.

Maybe a sensible workflow would be to run a macro to highlight all xRef fields and then run a find to jump from highlight to highlight and let you eyeball the field result in context before jumping to the next one.

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Andrew Lockton
Chrysalis Design, Melbourne Australia