While you wait for answers, we may have found some information which could help you.
Click here for Bosch Element Ovenhow can i increase volume on bosch timer?
bosch ovenHBA13B1.OB bulb cover?
How to remove the fittings to a Bosch light bulb oven?
hinge from oven snap shut?
Hinge snapped shut on Bosch ovenHBA138B150B/05?
Door hinge on Bosch oven ?