Do you happen to know who provides service on behalf of Best Buy in RD? That information could make a difference.
Only manufacturer's authorized service centers in the DR. Under a deal with Best Buy and the manufacturers, the original manufacturer's warranty is honored in the DR. Once the manufacturer's warranty stops or does not cover the damages/repair/parts, Best Buy warranty is also honored via the same authorized service centers. If the price of repairs (including parts) is deemed too high by Best Buy, they will refund your full price paid for the TV set, minus taxes and warranty fee.
The manufacturer's warranty will be honored in the DR, even when the goods were bought outside the country and shipped to the DR from Best Buy.
That's to say that the same warranty the retailers provide (manufacturer's) in the DR for the same TV set, will be equally honored for the TV set from Best Buy.
They will have you contact the closest manufacturer's authorized repair center to you when you call them for service. That will depend on where in the DR you are with your stuff. They will issue a contact number and a service order number to have the TV set checked and the repair estimate provided to both, you and Best Buy (depending on the basis if the Best Buy warranty kicks in).
I asked a lot of questions when they offered me the extended warranty thing as I purchased the TV set.