Ok so on 8b how many dead /non working leds? Can you properly identify them in a list. We should e able to fix the pass through /buffer part with an ic changeI can confirm going node 8 to 8c, back to node 8b does work. So node 8bs passthrough is dead, but node 8cs is fine.
Although still nothing from node 8b to node 8d.
8d is most likely a dead serial ic or the watchdog ic so thats an option for this one to.
The motor driver board i think we can bench test at the same time and work out which serial ic is dead to
So i would just send all 3 to me for diagnosis. I will dm you the costs etc but its gonna be way less than 2/3 new pcbs plus shipping & vat etc.
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