Pinout of Left analog stick

Hello everyone.

I was unlucky with a recent purchase, since the previous owner scraped few pads under the left analog stick. However I was able to find most of the points where do those lead to, but I have problems with probably the Y 3leg thing. ( the one which is at the edge of the inner side of the board.

As I measured the top one should be the GND, second one is dead-end ( do not find where it should go ) and the third one just have a connection with the other 3leg thing, or TP103 on thumbstick board. Where does the middle one go? It should be the signal pin,but I am not so sure.

The other question, when I press the button (L3) where does that pin lead on the board as well? unfortunately both of its pad scraped off, otherwise I could short them. In other way, those two pads are missing which is next to C37.

Thanks!