A changed temperature around adjacent furniture deserves attention, particularly if the installation or stored contents have changed. It does not identify a single oven component.
What the observation means
Blocked ventilation, altered cabinetry and a cooling problem are different possibilities that need proper assessment. Do not store heat-sensitive or combustible items in a location that becomes unexpectedly hot. The manual's installation clearances must be respected.
A useful next step
Note any recent cabinet work, new drawer contents or change in fan behaviour. If there is scorching, smoke or an electrical smell, stop using the oven. Do not drill ventilation holes or remove panels as an improvised fix before the installation has been checked.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.