My Breville BOV900BSS has problem with the SELECT rotary switch. I have to turn it very very slowly to move the selection up and down. Otherwise it will jump to the very bottom selection (DEHYDRATE) . I suspect the switch is bad. Breville doesn't offer any parts for sale. You can send the unit back for a high repairing cost. I don't see any marking on the switch. Any one has any idea about the part number of this switch.