Just adding to the info above after fortunately finding this website after my “plastic post” broke on my built-in GE Profile microwave . When you push the button to open the door like you have numerous times before but this time you hear a snap and feel the button go all the way in freely you’ll hopefully find your way here. First thing to do is unplug the microwave so that the light will go out and the turntable will stop turning. You’ll have to unplug it anyway to remove it from the wall to fix the post. After you use the thin piece of cardboard to jimmy the door open the next task is to figure out where all the screws are holding the trim piece on and then the ones mounting the unit to the wall/cabinent. Once you get it out of the wall/cabinent and remove the housing a quick search will find the broken plastic post and the “plastic cam” that rotates on the post laying somewhere. After you actually see these parts and where they should be you’ll realize what a lousy design GE has come up with to actuate...