Accenta 8 Alarm - How to Turn Off Tamper Light?

Having opened the internal bell box thing by mistake (I thought it was the door bell) and closed it again, the red tamper light is now permanently on. The alarm has gone off randomly a couple of times too… not the full outdoor alarm luckily, just the internal bell box thing.

Entering the code at the control panel switches off the alarm when it sounds, but the red tamper light is always on.

I've been given the following advice, but would like to double-check before I start tinkering.

I need to open the internal bell box thing again and make sure that a switch thing is properly deactivated, before closing it and screwing it shut again.

I need to touch together a white and a green wire. I'm assuming these will be in the main panel rather than in the bell box thing.

I also have the engineer's code. Will entering this do the trick?

Clueless of Leeds.