If this is a brand new tractor purchased from a dealer, I would think it could be covered unver warrenty. I do not believe that a helicoil is the fix for this application. The stripped out drain plug repair kit is your next best option, but they reduce the flow considerbly. I would pull the pan, and get it fixed properly. Even if that ment welding in a new fine thread nut to the pan. If the helicoil fix leaks, or cuts loose under operation, and you dump your oil, it could be a costly mistake. Don't mean to put fear into you, but when you go operational, I would leave nothing like that to chance.