Hi Frank,
I am looking at the guts of a dead Black & Decker B2005 bread machine right now.
I can identify the component that you need information on.
As you said, it is a small, blue zener diode (looks like a capacitor). The name and number on it is SINGERA 70421K.
For the burnt track, you can probably bridge it with a jumper.
JohnT
March 2006