Checking the Accuracy of the Clock on a NuTone IM4006 - Sends me down a Rabbit Hole of Thoughts

It was a simple request, by our Customer - Check the accuracy of the Clock on his NuTone IM4006 Master Station While some of the steps to do this seems straightforward - I obviously didn't get the "adjustment procedure" correct - I Guess??? ( I still think it's somewhat wrong or incomplete) Anyway - The rest is in the Video

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