How/Where to view log of Journey assignment for eligibility?

Summary:

Hi,

We have a journey that needs to be assigned based on an eligibliity containing a fast formula.
The formula checks if there has been a change from a certain grade to a higher grade and assign the journey.

Is there a way to debug why journey did not get assigned? We have written RET = ESS_LOG_WRITE and put comments to debug.

Question - where / how can we see the log files to see debug the formula as the journey is NOT getting assigned.
Any help is appreciated. thanks.

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