I was recently given a copy of ELSA by a mechanic i know in my local VW garage

If you listen carefully you can hear this/these pop open when you close the door, assuming all the windows are closed, not sure if there's one on the other side or not, it doesn't say.

You can see here where it vents into the boot, doesnt look like it's connected in anyway to the grill next to the light, I assumed this vent was to allow air to travel up the C-pillar into the space between the head lining and the roof skin to prevent moisture build up?
