Hi Al; Most likely is the little Sub-In board is off a row of pins. Or possibly the KXV3 has a missed pin. Or one of the little black cube chokes (L1,2,&3) on the Sub-In board got knocked off. (I assume you have the KXV3B in "nor" and you have tapped 9 while in that menu to toggle the "B" on. Then cycled power to make it set. Keith WE6R