As the title says, I am having an issue with 2nd base registering correctly in my 1972 Gottlieb World Series Pin. I do not have a schematic for the machine so I am wondering if anyone can point me in the right direction for where my issue may be. I was able to get 2nd base to work intermittently after a moderate cleaning of the switches, but without the schematic I didn't know where to focus my efforts. I believe that the issue is not isolated to the switch but is within the relays. If I knew which relay to focus on that would help, also any tips on cleaning relays would be greatly appreciated!