Carling off/standby/on added.
I pulled the GA-5 2-way power switch and removed the brown wire that goes to the IEC socket and the twisted pair of black and black/white wires from the PT.
I moved those two wires over to the Carling switch (see diagram below).
I removed the short white jumper between the rectifier diodes and the first filter cap, replaced that with a twisted pair of 18 gauge stranded wires (red and green).
I connected the diode/filter wires to the Carling switch (see diagram below).
I installed the Carling switch so that the end without lugs faces up (flipped the switch around as it looks in the diagram below) - and bundled all the loose wires together with mini tie wraps.
The switch works flawlessly.