Quoted from Darkmithrander:
Actually figured out what you meant here and moved the CN8 plug over 1 space. When doing that, all switches in that column worked except 1, the egg cracker. Could this be as you say a cold solder joint at the third pin AND something at the egg? Or possibly something else?
Now rest the switches that are now on the other pin. If that column now doesn't work then you either have a cold solder joint on that pin or a transistor/chip problem.
What I originally meant was to move the plug (up down left right) while plugged in as you are trying to activate the switches to see if they would work when you put "pressure" on The plug. In this case if they worked then I would reflow the solder on all the pins. If it still is problematic, replace the connector.
Moving the plug over one pin is what I was going to suggest next to test exactly what you did so good problem solving on your part.
Normally a si for switch not working will indicate a broken wire or switch someplace. I do t have a manual in front of me so I am not sure how far down the line that switch is. Normally if you have a broken wire then all switches past that point don't work.