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Interesting. Someone else here might have experience with these weird beasts, but they are extremely complicated inside.
My first impression is that the fault code itself could be the fault. I have fairly extensive experience troubleshooting automotive computers, and sensor fault is by far the most common outcome of things like ECU computers. I haven't ever seen the situation you are experiencing, but I would tend to think it's highly suggestive of a failed sense circuit that is incorrectly reporting a failure.
That being said, it would be most prudent to check and make sure that all specified conditions are okay.
ICs do fail sometimes, but most issues I've encountered are due to failed components that support the operation of the ICs. Leaky caps, drifted or cracked chip resistors, noisy or failed transistors, etc. And when the ICs fail, it's typically because of the failure of something else in the circuit.
Again, I'm not sure if someone else here has specific knowledge of Sony HDCRT failures, but I think it would be extremely difficult to speculate on the nature of a fault that doesn't seem to have occurred (at least yet).
The only path I would see open (to myself in the same situation) is to check the G2 and the areas around where the ICs are located that the service manual is complaining about. Sometimes you get lucky and there's a burned mark on the PCB, or a visibly damaged component.
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