So EKWB is going to send new screws for it, going to clean the copper. According EKWB the dark spot is a finger print, This normally wouldn't be there, because they have to use gloves when fabricating this. I can say that even this isn't a rma case from them, they will help me. with the reseller is a different story. With the reseller there is minimum delay of 3 weeks with their rma service.So problem solved, thanks to EKWB.