For those speculating about autoflight ILS approaches and go arounds on the 737, they are normally flown single channel autopilot for Cat I and most companies only allow dual channel for Cat II/III or practice autolands. On disconnection of the single channel on Cat I, the autothrottle is also disconnected - manual control, manual thrust; Boeing insist on an all or nothing method on the 737, unlike their other types.
In my airline (Dutch loco) Cat1 app are flown single channel or handflown. Dual channel Cat3/Cat3B. or training.
pressing TOGA while on a single channel app will give TOGA autothrottle while instantly disengaging the autopilot
Yeah that's how our NG's works.