I am one of those who likes the power switch to work so have kept it in the circuit. In my case it was the brown and blue wires at bottom of the power pcb that went to and from the power switch - the third wire (in my case red not light blue) was not involved. The photo shows the wiring - heat shrink keeps the joins tidy and I then used a dab of hot glue to keep the wires in place (not shown).
IMHO I could not detect any degradation in sound with the switch in or out of the circuit.
wiring if you want to keep the switch
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