I would first export the travelling library – and save it to a new name for now.
I would then make a copy of the file and try to use word tools to convert to plain text? (replace command with Control, if you are on a PC)
Command-A (select all the text in the doc).
Command-Shift-F9 (changes all the field codes to text of just the results).
or
Command-A (select all the text in the doc).
Command-6 (changes all the field codes to text of just the results).
You will also lose the ability to update tables of contents and the like, but you could also only select the text of the document and not the front matter to run the word tool on.
If that still doesn’t work, you can try running the convert to temporary citations, and see if you spot any citations that don’t convert (they are usually the rogue ones), convert to plain text (or use the word tool above) and then reformat, but you might need that travelling library to update them back to citations.
Then you may be able to run the endnote tool or the word tool to remove the fields.