(1) where to get bitmain service:
https://www.bitmain.com/

(2) After sales support (repairrequest、check the warranty etc)
https://shop.bitmain.com/support

（3）choose the official repair centers：
https://shop.bitmain.com/support/maintenanceOutlets, 

Generally, customers from European and other countries who want to repair their antminer machines cross-border can choose this repair point to repair their miner

Want get more information, please visit：https://cooldragon.io/