For
DiagnosticReport-cardiology-report.json
"presentedForm": [
{
"contentType": "application/pdf",
"url": "http://example.org/pdfdownloads/cardiopanel-report-123.pdf",
"hash": "EQH/..AgME"
{color:#000000}}
]

hash is not base64binary
 
and for DiagnosticReport-cardiology-report.xml
<presentedForm>
<contentType value="application/pdf"/>
<url value="http://example.org/pdfdownloads/cardiopanel-report-123.pdf"/>
<hash value="EQH/..AgME"/>
</presentedForm>
</DiagnosticReport>

hash is not base64binary
 
An accepted value would be

RVFILy4uQWdNRQo=