Wiring and electronics related parts are the most difficult components to diagnose. Thanks to the author of the video for sharing his experience. Now many people can reduce their headaches. I don't think the manufacturer deliberately designed the wiring to fail. Most likely this was not foreseen. Because problems with wiring for a dler are not easy either. It’s good if the service engineer has already come across such a breakdown. In this case, he eliminate it quickly. And if not, then it can result in long hours of troubleshooting and then a large amount of dollars. Because work with wiring is not regulated in time.