I'm pretty pleased with the service of Bitmain Warranty in Denver, CO.  
Even though the board they repaired for me didn't work properly after all (it keeps dropping to zero hash rate and shows a row of x's),
they handled fixing the situation very well.
They will send me a working hash board in exchange after I have sent (I just actually came back from the post office) the faulty board back for them.

I can definitely recommend them for fixing your miner.

And thank you Phil and the others who have shared previous experience with them.