Where did the pin come from out of curiosity?

With the game turned off take a small flathead screwdriver maybe 1/4" wide but not too thick and locate connector 1J10 and 1J8 on the CPU board. Make sure the connectors are seated and make sure on 1J10 the 9th 8th and 7th wire are on the connector (White-Brown, White-Red, and White-Orange respectively) and push the wires into the connector with the screwdriver to seat them. On 1J8 its the 7th wire Green-Blue make sure its there and is well seated. Also check the other two switches in the kings chamber and see if they work. If none of them work and all the wires are properly seated and making good contact it could be the Q47 Transistor that is bad. You can look for it on the CPU board with a flashlight they are labeled and the transistor is a 2N3904 . 1J8 connector should be on the lower center of the board and the Q47 is just above and slightly to the left. 1J10 connector is to the left of 1J8. Make sure you turn the machine off when working on it like this. Unplug it if you wish. You can also look online on how to test that transistor with your DMM you might be able to get to it without taking it out of the machine too just to test it. This is all if reseating the wires into the connector doesnt help so you are going to have to test each step of the way! PM me if you need to!