I had mine done a few month back and it went away for a while but I think its coming back when you first start it kinda cold... I did notice that the noise goes away either quicker or slower depending on the outside temp!
Im still going to take it back, I think after I put some miles on her now it's time for a recalibrate or whatever the program does...
The TSB is ..... sorry I would have to look it up on here again, when I first told the (New to the area) Kia service center that hadn't had a clue...TSB what ?? is the first answer I got nut they did find it and do it in less than 1/2 hour.