Does anyone know if you can replace the bulb in the heated rear screen switch and if so how?

Mark:blabla:

The bulb + holder has a part no. STC1877 Orange STC1878 Green so you can.
I suspect that you have to split the switch case by pressing down the locking tabs if the bulb is not directly accessable.
 
Bulb holders are clearly visible when you remove the switch, and they are colour coded-one green and one orange. Just take a smallish screwdriver and turn the slot anti-clockwise. You may need to tap the switch on the table to persuade the bulb holder out.
 

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