[ainarssems]

By looking at photos of engine bays of D3 I don't think that removing grill will give you enough access to open the bonnet but Roberto might know better as he has a D3 so can look at it in more detail on his. I believe there should be non destructive way to get in I am thinking of going in from below with endoscope camera to investigate and then possibly access from below with custom home made tools to open.

Also going back to A8Doc comment about Audi dealer opening it by removing bumper in 40 min, I don't see how can you remove bumper in nondestructive way with a bonnet closed as there are some bolts that you need to undo under the bonnet to take bumper off. But then again I don't have another D3 here to investigate in flesh .