They are different tasks and may involve different access, materials or responsibility. A faulty result does not prove the pump alone needs attention.
What the observation means
The system's route and connected fixtures can determine what is required. Replacing a unit without addressing an external problem may leave the symptom unresolved.
A useful next step
Ask for the assessed scope to be clear and keep any further work separately identified. Do not interpret a component price as a complete installation correction. The agreed work should match the actual findings rather than an assumed single-part solution.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.