Changed out the Reverse Light Switch today.
Did it while in the car.
Sad and very sore right now.
Disconnected the rear gearbox cross members.
Removed the upper Pitch Stopper.
Disconnected the exhaust flexible joint.
Tilted the engine/gearbox back supported on a jack.
Could just get up in there with a crow's foot spanner to loosen the switch, using 18 inch extension bar from the rear of the gearbox.
Getting the new switch to thread into the hole took infinite patience.
It is doable without removing the gearbox but not fun.