B7 Avant third brake light removal

[GuyG]

The light comes on as soon as I press the brake peddle for the tailgate brake light.

I'm in process of taking it out to inspect it but have come to a halt and hope someone here might be able to help me - Google is not being helpful.

I've stripped the inside of the tailgate, thinking there might be bolts that release the spoiler to access the light.  There were two 10mm bolts, which I have removed. However, the spoiler is still held fast.  Is it also bonded on or am I going about this wrong?

Thanks, Guy