Sorry about the confusion ^_^ The board in question is indeed a Konami Aliens; I mentioned the X-Men because it is -now- in a cabinet that formerly housed a 2/4 player X-Men board. I decided to get Aliens and put it in that cab after I got a 6-player X-Men cabinet. Don't need a 2-player version when I have the full 6-player ^_^
Yea I am, mostly, correct on what chip is throwing the errors but could be mistaken about what exactly that error is. Game play is fine, title screen is fine, the photos in that opening sequence is fine, background on the stages are fine. Sprites are screwed up, but not all of them; the Ripley character is OK, as are a few items, but the Player 2, most all of the Alien sprites, and a lot of the other elements are screwed up/non existent. The test mode diagnostics come clean on everything except the one chip.
This chip I have done everything I could think of and a few things others could think of to get it to work; the sales folks I bought it from had it running up till the day they shipped it to me.