Congratulations Sullo, and welcome to the Extreme Machine end of town.
Keep Miss Silvia powered up because a coffee or ten may come in useful throughout your journey of discovery.
So you dont know whether the machine works? Does it need any work?
Does it need descaling?
If you are itching to dismantle, Id take lots of pictures of the set up, from all angles. Comes in very handy later.
You may want to remove every nut, bolt and pipe and descale with citric acid, along with the boiler of course. Perhaps that is not necessary though if it is in pristine condition and has been run on softened water.
Perhaps you can disable an element and power up the machine on a normal circuit to see what goes.
New group seals may be advantageous. The groups --Id dismantle one of them, keeping the other intact for reference of where all the bits go.
Have a look at the condition, whether it drips, whether the solenoids work.