Tailgate lock–I need your advice

Good evening together, since March a Volvo V70 2.4L gasoline drive and so far very satisfied with the car. Apart from a few small things, he spared us with bigger defects so far. The problems were solved by the car dealership on guarantee and that without discussion-very pleasant as I find it. Last week our third brake lamp failed, we got a new rear flap cable tree and since that worked everything again. Until tonight:-( I wanted to drop the trunk flap into the lock, but it refused stubbornly. The car was open and the rear flap lock was closed. Of course there was no one left in the car dealership. So the Adac had to hit and he found a small spring that blocked the locking mechanism. The thing was removed and the lock is again doing its work-it closes;-) I wonder now where this feather comes from and which function the feather has in the rear flap to look at? If I open the flap now or close it is always heard behind the panel – I could present it to me, which is still something that I wanted to fold around?