I assume this is laminate, since solid Brazilian Cherry in an amount to fill an entire house would be worth more than my entire house. If so, be very careful when refinishing. And if the clear wear layer is actually worn through in some spots, the various "rejuvenator" products won't be the answer.
I think if it were me I'd bypass the jerk who sold it to you and find the actual manufacturer. Home builders typically warrant stuff for one year only, but in many cases the manufacturer's warranty on things like flooring or cabinets lasts much longer. If your builder won't take the time to at least look into that for you, he isn't much of a builder in my estimation. Make sure you give him all the word of mouth advertising he deserves.
Polyurethane gets my vote if you have to do a complete refinish.
Jerry