Here's my input, trap door didn't work from the get go. I'm not capable to fix it and tried. Mine was NIB. and manufactured in late 2018.
Long story short I had my tech fix it and he removed it took it apart monkeyed with it and fixed it.
My tech is one of the best in Chicago and restored his own Funhouse which he said the trap door is essentially the same.
Never had a problem since. Good luck.