All Solar Panel Diodes tested OK. What else can it be?

Firstly, thanks for watching until the end 😑.
Secondly, I'm still ins search-mode with these panels. I'm trying to explain and show why it is not so easy to find this fault. Maybe there is no fault and it is just degradation? Nah, can't be.
So, here is the last video with this stuff of measuring solar panels. OK, maybe the second last one...

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Видео All Solar Panel Diodes tested OK. What else can it be? канала Off-Grid Garage