Thinking about price... What do u think about the idea of driving a few miners across the border and ship them to the USA site? Its about money, but have you considered that?
It's been a few years but when I had my issue it was just a dropped chain on 1 board. I believe I inquired about that and because I was a Canadian customer based on my order it was still a no from Bitmain in regards to driving over the border and shipping.
Your best bet is probably weighing the costs against the repair shop Phil was mentioning. It's annoying to have to think about that when you are under warranty. Before Tarrifs and stuff I would have said it may be worth having them shipped to the US and drive over and pick them up, but that would be pointless now.