Describe the pattern
Say whether the sound began after adding a tall tray or changing rack height and whether cleaning deteriorated at the same time.
Avoid a parts guess
A recording cannot prove a spray arm is damaged. An engineer can consider movement and circulation for the model if the complaint persists, without requiring repeated noisy wash demonstrations.
A useful distinction
A tall object may obstruct movement only when a rack is pushed fully home. Describe the load arrangement already used rather than repeatedly running the machine with the suspected contact to make the sound clearer.