Hello,
If you need to activate the verbose logging in the Office Web Apps server you have to set it with the following PS command:
Set-officewebappsfarm -LogVerbosity Verbose
Once it has been executed, we need to restart the OWA service
Restart-service wacsm -force
Once we have finished doing our tests, we can set the log level as default, to do this, we need to execute the following PS
Set-officewebappsfarm -LogVerbosity “”
Once again, we need to restart the service to take effect
Restart-service wacsm -force
That’s all!
Albandrod's Memory 
Where do we find the logs though? 🙂
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Hi Brian, long time ago since I wrote this post, but i think that you can run in Powershell the following command: get-officewebappsfarm (or something like that), and you will have aproperty which will say where the logs are stored
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