I bought a bag of the NOS AMP pins from someone on Ebay many years ago. Were like $1 each at the time which was painful to pay. They might show up there again from time to time. I haven't used any of them yet due great luck in being able to tweak the contacts back into service. This will not work in all situations but worth a try.

With the power off, remove the connector from the board. Look at the contacts in the connector in question. If you see one that is "flat", use a tool with a hook on the end (I use a old dental pick) to bend back the peak in the contact surface. As you can see in the pictures above, they are supposed to have a peak that presses on the board contact. This can be bent out of a pin if mis-handled or gets bent out of shape. Alternatelay, you can remove the pin from the housing and use a small screw driver to bend the peak back in the contact.

DO NOT bend it out too far (you can break the metal) and DO NOT bend ALL the pins out "just because". You risk making things worse by tweaking pins that are in proper position.

Each time you bend the pin back into shape, you are weakening the metal and it will only work so many times, if at all.

Clean the contact pads on the circuit board side of the connection with a fiberglass sanding pen. https://www.amazon.com/K-Tool-International-KTI-KTI-70550-Sanding/dp/B000FN8H52/ref=sr_1_5

These 2 steps have restored connection on all the Williams card-edge games I have repaired. Good Luck