There is no way I would replace a tranny with 47k miles if it was performing properly. These babies can easily go 250k miles and still perform flawlessly. Just have them replace the front seal "under warranty - their dime" and keep your $$ in your pocket where it belongs.
The "kick" down o ring is easy but because it "looks wet" is no cause for concern in my opinion. The leak at the dipstick is probably nothing to be concerned about either. I think they are blowing smoke because they hate to eat the cost of replacing the front seal that they messed up on to begin with.