I'm having an issue with the player 3 gun buttons. both the Trigger and bomb button do not work. the buttons themselves and the wiring has tested good so i believe this is a board issue.

I tried jumping the pins on the board and nothing worked.
looking at the schematics it goes through a 74hct244 (U124). I'm wondering if it has failed. i can try swapping it with U115 as its not using player 4 input.

has anyone had an issue with this before?