4 switch woody left joysick up stopped working; boardpics what should I do?

[redsteakraw]

so my Atari 2600 4 switch woody's left joysick up stopped working I tried multiple joysticks and the up direction doesn't work anymore. I have the pictures of the board what should I do? Now that I have the board out what would you do? I can solder but I don't know where to start. Also should I clean the board and how should I clean it up?

 

[fluxit]

You checked that all nine pins are still there in the port, right?

 

Up is pin 1, which is leftmost on the upper row I believe.

[SoundGammon]

Pin 1 goes to pin 8 of the 6532 RIOT chip, check continuity between them.

 

If open, bad trace, if good bad 6532 RIOT chip!