2006 B6 tyre pressure warning light - wont reset

The set/reset button is by the gear stick on my car. I have new tyres and the pressure is set correctly. Pressing and holding the button referred to doesnt do anything (no beep no flash of light) so I want to replace it. I am not clear how to remove this part - grateful for advice on how to remove it. I also need the part number of the switch so I can order a replacement to try that. Many thanks.

edit: it is a 2008 vw passat estate not 2006 if that makes any difference. thank you.