I second that.

And I am not familiar with the node board operation, so take this as just a guess:

Looking at the node board schematic, the overcurrent protection is OK and effective with normal loads shorting. Since your board fries immediately, I suspect solenoid voltage somehow getting into LED drive lines. OC protection can't handle that fast enough.

So, remove all connectors from the node board and check voltage against ground at each cable side pin. Node board is not needed to be connected at this time. Don't know the actual voltages, but I suspect the board operates by grounding the driven outputs. If you see much over 5 volts at any LED drive, look for a short of solenoid voltage to that LED. Not sure about the exact voltages, but if you see one that greatly differs from the others, you have found the problem.