Not every model includes interior lighting. Check the specification before assuming a hidden lamp has failed.
What the observation tells you
A manual covering several versions may show a light marked as optional. Removing a blank cover to search for one can damage the cabinet. This differs from a known working light that has recently stopped illuminating.
A useful next step
Use the complete model reference to confirm the equipment. If a fitted light has failed, follow its service instructions; some LED assemblies are not owner-replaceable. Cooling performance must be assessed independently from illumination.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.