chicken
SHEOOOOOOOOT
Aha!!! I thought that's where it was. I messed with that plunger some yesterday. I didn't turn it, though. I just sprayed it and punched it in vigorously a few times hoping it would losen up a bit. I'll try turning it this time and see what happens.
Edit: It didn't work.
the door ajar sensor is in the bottom of the latch, you just twist it out