All my reading online pointed to the damper doors, and by standing in the open door of my fridge, I patiently waited until it happened again, and determined it was the ones behind the crisper. Problem was, there's both a single unit and a double set of doors listed on your part list. I decided to order both sets (and they came in two days, thank you). I watched your great video and even though my unit didn't perfectly match the one you demonstrated, it was close enough that I made the repair in a little more than an hour. BTW, after getting inside the unit, I found I only need the single door piece and could have returned the more expensive one, but I just went ahead and replaced them both.