Tempest troubleshooting

Greetings from a long time lurker.

I'm currently working on troubleshooting my first Tempest board and I want to make sure that I'm on the right track. This Tempest was working fine for many years prior to this. The game powers up and plays blind. The spot killer is on. I dusted off my oscilloscope and checked the X and Y out. Y is fine and X is not. On D/E 12 I have nothing on pin 3 or 5. I do however have activity on pin 9 of C12 and can see and play the game on the oscilloscope. Can I assume that I need to replace C12 or should I be checking associated components?

Thanks,
Jeff---------------------------------------------------------------------------
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Received on Sun May 1 14:19:35 2011