tech: donkey kong repair

chips4sle

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hey
i have a donkey kong board thats got a problem
everything seems to work fine except i get lines above the ladders to the right of donkey kong. basically 2 purple lines and what looks like static above each of them. any ideas
 
here are a couple of pics of what my game is doing

that's a rather unique one. there's a DK at an arcade near me with the exact same problem. the game functions normal and the rest of the screen is completely normal, except that there's a bunch of random crap above the ladders. no sprite or playfield errors aside from that.
 
Could it be a character ROM problem? There's a black bar that covers the area over the top of Kong's ladder. It's to hide the 2 girder sections where he disappears in pieces as he walks up the ladder (you can see this on Crazy Kong, which doesn't have the black bar...apparently that's how they "fixed" the problem in DK, by hiding it ;) ) You can see the 2 girder pieces on a PCB that's running normally, but they just flash very briefly at the start of the board, before the black bar appears.
 
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