Warranty? That's pretty funny. First you must speak Chinese because you have to call their "hotline". Next you get to hope someone actually answers the hotline (most reports are...no they don't) From the only report I've seen where someone got thru, they asked that person to send their whole miner back, at the customers expense, while admitting they had no replacements. Most of the time one hash board goes bad and they could just send you a new board, but...doesn't look like their service is really worth anything. From reading bitmain threads about their warranty I think it's about the same level of service, barely existent mabey kinda sorta if their in a good mood.
I might hope they would improve this, but, I kinda doubt it.