Thanks for the info. The one in your screenshot is the one I have now (XC1000 diagnostic), located in the Xerox folder on the PC which has the PCUI installed on it. It was part of the PCUI installation. This is the one which expired after 10 days after installation.
For interest sake I have attached a screenshot of what the one we had before:27March2018.jpg
The Icon is the third one from the top: PC-Diag
The Diagnostic in the PCUI I find pretty useless, PC-Diag has more options and was more detailed and the XC1000 diagnostic (of your screenshot) is even better.
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