Valves
The way I look at it is this:
The environmental valve is powered open, so loss of power = valve will close,
The instrument valve is power closed, so loss of power = valve open.
Reason: I figure design was for safety, is power lost to the system, the safety is to ensure the boots will still inflate, pressure can be dealt with by descending but from a safety standpoint the boots need to be opeational.
Circle on the switches, another easy way to determine additional load shed in case of a dual gen failure. anything without the white ring, to my knowledge, will be load sheded, so when determining what else to shut down, just find the rings.