You should be able to read the changelog with a search like:
ldapsearch -h 151.132.97.73:389 -D cn=orcladmin -w pwd -b "cn=changelog" -s one "(changetype=*)"
Substitute the appropriate values for the "cn=orcladmin" and the "pwd" for your account.
11:09:50 653B0240 Drvrs: OID-LDAP-032796 PT: OID-LDAP-032796: LDAPPublisher.processChangeLogEntries() res.next() Error: LDAPException: Insufficient Access Rights (50) Insufficient Access Rights LDAPException: Matched DN: