Remember after replacing your boards you still have a 40 year old game with 1 or more new boards. Connector pins go bad and corrode. Wires become brittle and break. There are 2 style of connector pins; .100 spacing and .156 spacing. You can purchase these at many of the distributors here.
You can watch this video below to learn more about how to repin connectors and fix broken connections.
The following video offers another option using a crimping tool.