I'm in the same boat, I'm trying to figure out if I should send the whole S9 back to bitmain (high shipping cost, lost revenue), or to just ship the one faulty board to BitmainWarranty
Bitmain has a California based repair center now...
Are you sure they are active? I called their phone number earlier today (which was posted on Bitmains website / Repair ticket walk-through) and it was out of service.
This is the contact: https://shop.bitmain.com/workOrderGuide.htm#_Prepare_the_shipment.
"2) US Delivery Address (If your miners/hashboards are currently in the US, you can ship them to our US repair site. Otherwise, the packages will be returned to you) Online consultation?
Name: Tomrepair-Bitmain
Address: 5640 Grace Place, Commerce, CA 90022, USA
Tel: (+1) 626 362 7240"