Ambika SMR-4 voicecard

Greetings, getting back to debugging an old ambika, mostly just trying to learn more about how it was built. Short version is that the volume on the sixth voicecard is somehow much louder than the other 5. I have been over the entire board, short of just building another one does anyone have any ideas for where to look or which components might cause this? This is just the init patch with env2 turned down, no oscillators, just the filter self resonating. As you can see the last voice card is significantly louder. Switching voice cards has the same result. I believe the components are in the right place but the fifth LED indicator is also not as bright as the other 5. So something is up, I just can’t seem to figure out where to look at this point. Thanks.