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Not the first time and not the last, when elevator with relay control started to behave wrongly.
Once again, the engine room was made available to me so that I could not only diagnose the problem but also film the failure searching process.
This time I used a rather unusual method, instead of staring at the relays with bare eyes, hoping that it will fail in front of me, and I will notice and remember what exactly happened, I decided to record the relays on a videocamera. Most of the problem finding process was done using laptop and by watching the footage frame by frame, backward and forward, closer and further, faster and slower.
I invite you to watch the story about this search.