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Got the part back yesterday afternoon, so I've refit it an it's worked a treat!

Welcome to the forum you'll find the members on here are a friendly and helpful bunch 🙂 lovely Audi you have there 👍

Thanks guys, I thought this might be what it is but was not sure enough to buy a tool on a guess, il order some and let people know the size I needed much appreciated 😊

O.K. Thanks Steve, I'll do that tomorrow and update the post accordingly.

Ok, just an update for those who may have a similar problem.... I removed the rear light cluster and thought that I could open up the unit, but unfortunately not. It's a sealed unit, so you can't easily replace the leds, so I purchased a replacement cluster and so far the problem is fixed. It seems that enough moisture go into the clutter to cause the fail. It does seem that it's bad product design from Audi, especially the water channels where the tailgate/boot meets the taillight cluster. The rubber & plastic trim isn't water tight and water can get through!