[Alan Brinton]

It should look like this inside, Andre. To the best of my memory, the reeds are accessed by removing the four screws and removing the blue reed chamber cover. Some related models have spring clips that have to be removed. This model can be given a bath, a good soaking in a water/alcohol mix (3 to 1 or 2 to 1). Shake it around, work the keys, etc. The key action is probably sticky, and that will be improved (though it’s usually still a bit of an issue with these models). 70% Isopropyl alcohol from the pharmacy, which you can also use undiluted with a cotton cloth on the tip of your finger to clean the keys and outside surfaces of the melodica. A leak is most likely to involve the gasket inside the reed cover. Its source might be visible, an irregularity or deterioration in the gasket.