However, the placement of this bulb isn't immediately obvious.
The symbols on these strips should light up when you turn your lights on.
If not, place a thin blade screwdriver into the back of the dash top triangle and lever it up.
Lift it up and disconnect both wiring connectors. Don't pull them by the wires. Lever them with the screwdriver.
Remove the Torx9 Screws. You can actually get them with pliers if you want.
Take everything out.
Flip the board and you'll see the orange top of the bulb, this is what lights the heater symbols.
It just twists out and the new one twists in. The bulb is a 509T bulb, also known as a twist fit bulb.
The standard fitment is a 12 volt, 1.1 watt bulb. You can buy these from smart and eBay.
If you are considering fitting an LED replacement, take a look here.