Robert Comsol wrote:
That screen is when Chekov is asked to look at helm and navigation control so it is unlikely warp engines and reactors.
Not necessarily as they are trying to cut off power
from the corresponding automatic circuit relay and switch to manual.
SPOCK: There is one possibility. The automatic helm navigation circuit relays might be disrupted from engineering level three.
SPOCK [OC]: Examine the H two seven nine elements, also the G nine five systems.
CHEKOV: Sir, G nine five system appears dead. All indicators are dark.
SPOCK: Thank you, Ensign. SPOCK: It appears, Captain, we've been doing what used to be called pursuing a wild goose. M-5 has rerouted helm and navigational controls, bypassing this primary system.
I removed your assumption (inserted text) that it is a "power" system being bypassed from the dialogue.
If we went by the dialogue, it is pretty clear that they are referring to the primary helm and navigational
system, NOT the power system of the ship. You could argue that the diagram is for all the control inputs like helm, GPS, inertial navigation, gyroscope, backup and computer inputs. However, warp engines and reactors? No. Not without changing the dialogue