Step1: Turn off gas and electrical supply and allow oven to cool completely before servicing.
Step2: Remove the access panel and locate the thermostat assembly inside the control compartment.
Step3: Disconnect old bulb capillary carefully from the thermostat body.
Step4: Install a new bulb in sensing position securely within the oven cavity.
Step5: Secure thermostat mounting and wiring connections firmly.
Step6: Refit panel and restore the power supply safely.
Step7: Test temperature control and verify proper operation carefully.