Hi GordonRobinsonIV,
Just like install, to upgrade, you must upgrade the Workflow Platform first and then upgrade the ServiceDesk modules.
When you start to upgrade Workflow you will see the version of Workflow that is currently installed.
The System diagnostic just lets you know that you need to install a newer version of Workflow a version between [7.5.2001 and 7.5.2001.9999].
The correct version of Workflow is included with ServiceDesk 7.5 MP1.
Refer to the Upgrading the ServiceDesk application software topic in the ServiceDesk 7.5 MP1 Implemenation Guide at http://www.symantec.com/docs/DOC6513
You can also see just the Upgrading the ServiceDesk application software topic at http://www.symantec.com/docs/HOWTO84708
Kindest Regards,
CNWilliams