OK...I found that booklet...it is about 30 pages...but under Operating Instructions it does say “carefully slide trays loaded with food into position. Once the trays are in place, place door and set the thermometer to the correct temperature. Now it does have a * next to that statement about replacing the door...”turn to age 28”. So onto page 28 it says “Be sure there is an even space between the door and the side of the dehydrator and the bottom of the door does not hit the sides. This allows moist air to exit”
I'll try it out this weekend and see what happens.
Now...where did I put those bananas?