If a user-accessible filter was opened, the timing and result can be relevant to a later leak or warning. It does not mean the customer necessarily caused the fault.
Understanding this situation
Explain which documented procedure was followed and whether the part refitted normally. Do not repeatedly tighten, force or reopen a component on a hot or water-filled machine.
A useful next step
Keep the appliance unused if leakage or uncertainty remains. Give the full model so the correct arrangement can be checked. An honest maintenance history helps assessment more than omitting the step because it seemed routine.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.