[SiriusHardware]

Expanding on Julie's thoughts in #1535 I suggest this, only when that track fault has been fixed.

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Scope UC7 pins 2, 3, 4, 5

Scope UC9 pins 15, 14, 13, 12 - should have the same waveforms on as the above.

Then scope the following pairs of pins together, always with the first pin of each pair on the upper trace.

UC9 pins
1 and 2
2 and 3
3 and 4
4 and 5
5 and 6
6 and 7
7 and 8
8 and 9
9 and 10