Space Invaders RAM issue - missing feet?

Guzuta70

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Hope someone can help.

So I have a Space Invaders pcb in a Dlx cab.

Game works and plays, but missing legs/feet on the invaders, anytime there is one is moving.

Missing in attract screen, game play, even in screen where little invader goes out and shoots the extra "c" in "ccoin".

Talked with someone and they guessed a ram issue... anyone have experience with something like this? How to determine which one it may be?

Pic:
http://preview.tinyurl.com/invaders-feet

Many thanks in advance!
 
Ram issues? I am leading towards an EPROM. If you got the board like this I would be looking for a bent pin on an EPROM. If the board was working an started to act like this I would be looking a corrosion on the EPROM legs or bad sockets.
 
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