The best bet would be to send it in to TC.
Do be careful about some of these Partial lapping methods if you do decide to lap use a reloading press or a vice to squeeze 4 round balls one at a time then drive them into the bore one at a time so they exactly match the rifling then use JB bore paste or value grinding compound to lap it; considering it was left awhole year the Pitts are very deep most likely and if you try something like patch lapping you could end up with a smooth bore. If you don't have much experience gunsmith the best option it tell TC what happened over thetelephone, and send it to them, that way if its beyond a reasonable point you will still get it fixed if you mess with it your self and its not fixable it also canvoid your warrenty. Lee