VIZ No. 18.2. TEAC AL-301DA embedded malfunction or error?

The second part of the unusual repair of the TEAC AL-301DA amplifier, in which we will deal with the circuit, etc. the brain was destroyed by excess supply voltage ... maybe try to resolve everything with an arduino, huh? .... In addition, the amplifier is full of various interesting technical solutions and surprises that are not entirely clear to me, and the main question. The TEAC AL-301DA amplifier HAS to break because it was designed by the manufacturer?! Or is it just an assembly error, or a marriage during assembly ... What am I talking about? Watch the video and you will understand everything.
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