Thank you. It turned out to be an "&" in a manual tag. Surprisingly, the "ñ" in another tag was fine and the Html italics in some of the journal article titles were not the culprits.
It took me a while to find the problem record, as the column number referenced did not match the position of the column in the export file. Is there a way that I can see the actual column order in ZMI next time?
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