What changed in my PDF after PDF/A conversion?

Q:

According to the manual for PDF/A Manager and ‘pdftron.PDF.PDFA.PDFACompliance’ there will be only minimal information loss when converting to PDF/A. To be able to check the information loss there are a number of Obj Refs in the conversion report, but I can’t see them marked in the document. Is it possible to see what objects that the tool has replaced with PDF/A compliant equivalents?