I watched the video on the dryer air duct assembly page, and followed it. It was almost exactly like my machine!
Pop open the top cover of the dryer, disconnect the wires from the door switch, remove the screws from the front panel, then swap out the air duct.
Easy!
I scraped excess lint out of a fan that the dryer duct dumps the air to for exhaust, so it added some time there, but it was a very easy fix!
Probably saved at least $100 in labor fees if I would have paid somebody to do it.