I'll be calling HiFiMAN tomorrow to see, but if I'm gonna have to pay +$100 to ship it to China, I might as well invest in a new pair of headphones or try to repair the HE-400 myself.
I'm ngl if I see the LCD2 for $600-700 I might bite.
I've had HiFiMANs repaired before, they have a service site in the US to which you'd ship.