This is in my Marble Madness. I think it's a WG7000 but it doesn't have the pots that Bob Roberts pics have. The last couple of pics show what the monitor is doing. Do you think a cap kit will fix it? Of course, I have to ID the monitor first. 
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All Bob is trying to show there is that the 7200, 7300, 7400, and 7500 are totally different beasts from the regular K7000. (i.e. different cap kits)
You'll notice other kits listed for those others.
Yours is a regular K7000 version.
K7000 13"/19"/25" color $6.00
This is in my Marble Madness. I think it's a WG7000 but it doesn't have the pots that Bob Roberts pics have. The last couple of pics show what the monitor is doing. Do you think a cap kit will fix it? Of course, I have to ID the monitor first.![]()