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SCL/SDA lines on diode mode cannot give more than 1% difference, respect to ground.
If not, remove D6950 and check again.
BIL connector is supposed to be disconnected, of course.
Next step, if needed, remove U7000 and test again.
If still get difference with only SMC on that bus, gues what?
BTW, try first to reflow it with good flux; could be only crap under SMC...
How can I effectively test if Q7055 is bad? It gets the 12.3V in but does not go out, pin 4 stuck at 12.3V . Pin 5 has a dropping voltage.. Starts around 4v continually lowers, rate of decrease slows as it gets lower.