Tudorp

Hi guys. Long time Makita user. I have a 30+ year old Makita 12V (6011D) drill motor. It has a burned component that I need help finding. I think it is a Diode, and it is mounted across the pins on the reverse switch. here is a picture. Can anyone help identify this, and what I need to find to replace it? I can read a S3V on it, and it has a blue band and silver band. Anyone confirm what this is, and where I might find it please.