Return of the Jedi graphics issues

Mongo

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I have a Return of the Jedi machine with a graphics issue. When the screen is static, both the background and the moving sprites are displayed fine. When the screen scrolls during play and both the sprites and background are in motion the sprites appear fine but the background appears as if it is being looked at through shutters.

I am fairly certain that this points to a bad video memory chip or chips on the output side as nothing shows up in self-test. Anyone have an idea on which chip it is?
 
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