Routine filter cleaning, a replaced part and a professional diagnosis provide different kinds of evidence. Combining them as serviced can obscure what was actually checked.
Understanding this situation
Keep records of previous work, the date and whether the original symptom disappeared. A later different problem should not automatically be assumed to be the same component failing again.
A useful next step
Describe factual actions and results to the booking team. Clarify any existing warranty or unresolved repair arrangement before authorising additional work. Avoid purchasing more suspected parts until the current symptom and compatibility have been assessed.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.