Got a game in for repair, 1975 Gottlieb FAST DRAW. Game has been to Germany at some point in time. Has solid state sound board(s), not Wico. Wires spliced into the chime wire loom only. Black and white wire soldered to the top board, green wire to the middle board, red wire to the bottom, assume for three different sounds? Speaker wires soldered to the top board only. No separate power supply wire like Wico has. No maker's label obvious. First time encountering one of these. Was wondering if anyone else has come across and is familiar with this?