Apple Genius Bar Replacement Service for Speaker Problem?

If I said there's a problem with my speaker (the sound is messed up) on my iPhone 5, will they open it up and check it / look at the water detectors inside it? Or will they just check the water detector on the sim card tray?

Because the water detector on my sim card tray is normal.

They would most likely open it up, as this would be required in order to properly access the speaker.

If the water detectors inside are not normal, just try protesting with them that the phone has never been wet, and they must have been incorrectly detected.