After you upgrade to Service Desk 7.3, ensure that you perform the following:
Restore the Custom Banners at <installation-location>/ServiceDesk/Server/webapps/LiveTime/images/banners/custom in the Service Desk 7.3.
Restore the Customized CSS file in the Service Desk 7.3 at <installation-location>/ServiceDesk/LiveTime/Style/novell-7.0.css
If you are upgrading from Service Desk 7.1, then customize the CSS in the Service Desk 7.3 again.
If you have made any changes in the Tomcat server such as the web.xml, server.xml files, then update those changes.
If you have made any changes in the Java such as the catalina.sh file, then update those changes.
If you have configured SSL, then reconfigure the SSL settings.