Use a safe alternative rather than relying on uncertain equipment. Repair timing and parts availability need individual confirmation.
What the observation means
A working neighbouring cavity may not be safe if the fault involves shared supply, gas or overheating. A booking request does not guarantee completion before an event.
A useful next step
Describe the urgency with the actual symptom and follow the confirmed arrangements. Do not continue unsafe operation or improvise electrical connections because a large meal is planned. The assessment must establish safe use rather than fitting around a cooking deadline.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.