Where is the lint trap on my whirlpool dryer?

My whirlpool stackable dryer Model YLTES43DQ, has no lint trap, that is at least noticeable. On the internet it states that it is 28 & 29 which on mine are not removeable, all one piece. So how can I clean out the lint without having to go to the ceiling and removing a screwed down trap door that had gather lint. This makes it impossible for me.