I appreciate all the help. I know a lot of old system 11s have hum but this is a not normal hum that happened all of a sudden to a game that had no hum at all.
I have checked all grounds, tried floating the board, unhooked cables, recapped the power supply, and have hopefully narrowed it down to the sound board.
I reflowed all the caps on the board just out of curiosity to see if maybe there was a bad joint. The hum decreased but did not go away. I figured since caps are super cheap that I would just go ahead and recap the sound board as we'll and see if it would take it out.