I have a Creature pin that has white noise or interference coming from the speakers. The speakers work and the game sound comes through but the white noise is still there, and is especially noticeable in attract mode. It seems to be affected by the back box lights blinking patterns and by the activation of leds on the speaker panel mod that the machine has. I'm guessing this is probably a grounding issue somewhere but I can't put my finger on it. There is a green ground wire coming from the ground strap in the back box that is connected to the left speaker on the speaker panel. I tried reseating the ribbon cables on the CPU to the flipper board to the sound board but it had no effect. Any thoughts on what to look for to fix this are greatly appreciated. Thanks in advance.