Mk2 Alarm problem

Bullseye

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Hope someone can help!

My brothers mk2 TT's alarm keeps going off. The fault coming up is glass break sensor rear open circuit 01403. I have checked a few threads but not sure exactly where this is, back window or the small rear windows? The heated rear screen is working. I'm wondering has anyone came across this before, before I dismantle the car to try and find it!??