PCB fault diagnosis video?

[Clarmrrsn]

I am a new member and loving the content of this forum, how I did not find this years ago I will never know, a wealth of information and knowledge.

Anyway, my question...

While watching one of Daves videos I seem to remember he mentioned that he had a made a video on diagnosing/tracing PCB faults (Using an OScope?)

I have been hunting to try and find it and beginning to wonder if I actually did hear that (maybe a few too many beers last night) 

This is a skill I would very much like to explore.

Was this part of a lucid hallucination or does it indeed exist?