Quoted from CrazyLevi:You could also have a shorted transistor or light socket in the lamp matrix, and it’s “lit” but not really lit. Do you see any other weird lamp behavior? Do a lamp test and see if two are ever lit when only one is supposed to. This can also be caused by “ghosting” from LEDs.
I'm having same issue on mine, plan on digging into it today. My extra ball insert stays lit as well as the green inserts that light when multiball is ready on either side. Oddly enough, during attract mode they behave normal.