They show what was actually found or replaced and whether the earlier symptom changed. That history can prevent the next enquiry from starting with an incomplete account.
Understanding this situation
A new issue is not automatically a recurrence of the old one, and a replaced part is not proof that it caused today's result. Keep dates and observations separate from assumptions.
A useful next step
Share relevant reports and clarify any unresolved warranty or repair arrangement before commissioning further work. Describe the current programme behaviour clearly. This supports an appropriate assessment without repeating guesses or buying another identical part prematurely.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.