Use a flat blade screwdriver to separate the two halves of the boiler. Inside the boiler, you can see the main components:

Boiler housing (to contain water and steam).

Heater coil.

Dual thermal sensors, presumably one to maintain steam temperature and one for max temperature shut down.

The bottom portion of the boiler housing has a rigid hose reaching toward the top of the boiler to draw water from the top to keep the heater coil immersed in water.

There are also two Klixon thermal sensors. The numbers stamped around their bases are:

1NT01L-0036 L95-10 9910 M 10/250~T200

1NT01L-0499 L127-15 9912 M 10/250~T200