When shaking the watch, some make loud whirring noises, others are completely quiet. I've got one that makes a quiet "tink" sound when the rotor has turned far enough to "add power" to the store. Is this a problem? It's an ETA 2842-2 movement.
Well, that's the thing. What is making this quiet "tink"? If it is not going to damage things then having someone open it up (even if they are a pro) risks damage.