When you tested Q10 did you grounded it by touching the top of Q10 with one side of wire and touching ground with the other side of the wire , if it doesn't fire get you DMM out and test Q10

sorry it was Q10, check the transistor with a dmm

Q10 is a TIP120
If you want to test it turn the power off then
Put the DMM's red lead on the left leg of the transistor
Test to the middle leg and the right leg with the black lead.
You should get a reading between .3 - .9 volts on each (the two reading should be about the same).
Put the black lead on the left leg of the transistor.
Test to the middle leg and the right leg with the red lead.
Your DMM should read open on each.
Test across the middle and right legs, you should get an open reading.
Reverse leads on the middle and right legs, you should get an open reading.

Well done , you should put a new pin on that connector and check the solder on the header pins on the board