I would try a dealer for the vehicle, but I would expect issues with any warranty claim... because the warranty is provided by the company which distributed the vehicle, not the one which manufactured it. Most, perhaps all, automotive brands are distributed by a separate corporation in each country.
For instance, my Toyota Sienna was built in the United States, by Toyota Motor Manufacturing Indiana, Inc. (TMMI), but the warranty is provided by Toyota Canada, Inc. A dealer in the U.S. would handle warranty claims through Toyota Motor Sales, USA, Inc. (TMS USA), not Toyota Canada Inc. Even though all of these companies are part of Toyota Motor North America, Inc. (TMNA), "that's not ours" seems like a likely response. Of course, it wouldn't break down due to manufacturing defect so this is only a hypothetical issue for me.
I had a Ford - on a long trip with an in-warranty car, I would be prepared to pay for any repair and hope for reimbursement.
Paying for a fix under warranty and getting work physically done are two different things. Any vehicle sold in Canada is so nearly identical to the corresponding model sold in the U.S. that ability to repair (parts and documentation) shouldn't be an issue.