A shared appliance needs the ventilation arrangement specified for the whole installation. A blocked cabinet path can affect operation even if only one compartment first shows a problem.
What the observation tells you
The exact relationship depends on the design, so a warm fridge does not prove a particular vent is the sole cause. A decorative grille may look open while the route behind it is restricted. Randomly drilling holes is not a reliable correction.
A useful next step
Check accessible openings for loose stored items and report recent cabinetry changes. Have the complete installation assessed where requirements are uncertain.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.