from them:

"We can see that there is an issue with your whole miner.

Please write in large writing on the box RMA 131223-08 and send the entire miner back to the following address:

KnCMiner
Birger Jarlsgatan 33
11145 Stockholm
Sweden

The shipping cost to us will need to be paid by customer and we will pay for the shipping cost back. Please declare value as 1000 US dollar."

And In the past I asked- never answered. Not only do they want me to pay return shipping, but also to undermark the customs. Pretty sure its illegal to do that... not happy with a establish company asking me to do that.