Door ajar light always on and many other things

Hey guys i need some help. Well lets start with the door ajar light always on my 2007 P71 and I have sprayed all the doors with wd-40 with no change. Also my door lock switch on both doors don't work either prolly since the ajar light is on. The window switch on both sides work including the mirror button. The next thing is my rear defrost doesn't work when I push the button on the dash. I have checked the fuses and relay and everything looked good there and don't find anything wrong with the grid on the back window. I have vids on youtube showing the door ajar problem, its under the name pauly713. Its been driving me crazy cause all this stuff is happening all at once. So any help would be awesome.