It identifies an apparent location, not a confirmed internal component. Sound can travel through the cabinet and be heard away from its source.
What the observation tells you
The divider may contain different structures depending on the model. Drilling, pressing or removing trim to locate a noise is unsafe. Keep separate notes for the sound, door behaviour and temperature performance rather than assuming all must share one cause.
A useful next step
Record from a normal safe position and explain when the sound occurs. Include whether opening either door changes it and whether the appliance was recently loaded or moved.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.