Hi @paul_ripley, In addition to Maria's suggestion to use the user Audit logging, suggest you checkout the QlikView Governance Dashboard. Once you get it configured and loaded, review the Applications > Objects > Sheets & Objects section as it may contain the information you're looking for.
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Expressions: Load ObjectKey, ObjectKey & Definition as ExpressionKey, Label as Expression_Label, Definition as Expression_Definition, SOE_Comment as Expression_Comment resident SOE where SOE_Type ='Expression'