Explain that service access may require separate building work. Do not break tiles or remove the toilet simply to expose the unit before a visit.
What the observation means
The equipment, connections and electrical supply can be concealed behind the finish. A panel's outline does not establish how it is safely removed.
A useful next step
Provide existing installation information and safe photographs of the arrangement. The team can discuss practical access and scope. Keep the appliance fault separate from the cost or permission needed to alter surrounding finishes, rather than assuming every repair includes opening the wall.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.