Transmission Already Needs Replacing!!

[USC78]

I have a 2003 H2 with around 45K miles on it. During a recent trip, I had trouble getting the vehicle to shift from 1st to 2nd. It also would not go into 4th gear. The dealership tells me that the "2 / 4 Band" is burnt. They recommend replacing the transmission at the cost of $3K! While my regular warranty has expired, I was hoping that it would be covered elsewhere (e.g., 100K mile powertrain warranty, etc.) The dealership says no. Any input would be helpful.