bitmainwarranty would be your best bet depending on where you live
If you're talking about the actual company Bitmainwarranty in Colorado and not Bitmain's warranty, I would agree. If you're in the US, it's pretty much your only option.
Yes, the min problem is that I am located in Spain, Europe...
I May try looking at the capacitors for seeing if anyone is broken.
I think sending the hashboards to US is too expensive from here...