Need PCB Button pinout for HRAP V3 SA

Tech Talk
1

I want to use the small buttons that are on this pcb can someone show me where I can solder wires to these buttons? Anybody got a pinout for this board? Here’s a pic of the board.
SW1=Turbo
SW2=Home
SW3=L3
SW4=R3

http://i975.photobucket.com/albums/ae236/Bird3332002/IMG_20170309_195807.jpg

2

Impossible to tell from this picture.
You can see that they all go to vias that connect to the other side of the PCB. You can follow the traces yourself.

3

There are pinout at this thread: HRAP3 PCB Front and Back

4

Thanks for the link. With my multimeter it seems that for SW4 the ground is on the right unlike the other buttons.