The dealer won’t fix it.. it will cost them too much to retail it after, they won’t get their money back. I think you have a high probability of at least $750 from the sounds of it. If you live in a county and state with high sales tax, and a tax credit for new cars, then it may benefit you to trade.. but the taxes on that amount are still relatively small so you may want to sell it to your uncle.
I’m not a fan of KBB because it’s not accurate enough, it doesn’t ask enough questions, and it doesn’t see or drive the vehicle..and they won’t write a check for a car.
Run your vin number and fill out questions on NADA.. that’s most likely what the dealer is going off of, definitely more than KBB. It will give you a more accurate idea, or it may even be the same which will give you more leverage.