Follow the manufacturer's isolation instructions. Keeping one compartment operating does not make an electrical fitting in the other safe to touch or wet.
What the observation tells you
A control marked off may affect cooling without disconnecting the supply. Shared wiring and service-only light assemblies also vary by model. Removing covers or spraying cleaner near a lamp is not ordinary wipe-clean care unless explicitly directed.
A useful next step
Plan food storage for the required shutdown and use only approved owner cleaning methods. Leave electrical inspection or lamp-module replacement to the appropriate competent procedure.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.