What wheelset comes on this Trek?
According to Trek's website :

Wheels: Alloy hubs w/Bontrager Approved alloy rims

And according to Bikeradar's website :

Front Wheel Weight: 1370g
Rear Wheel Weight: 1970g

I fear that you won't be able to replace the wheel with exactly the same thing since they seem to be generic wheels built for this bike. You can try the dealer you bought them from, they might have a replacement available or you can look for a different set elsewhere. In that price category you might have to buy a set (front+rear wheel) thought, but at least that means they will match.