I think you have probably got a few dead pixels on your image sensor, you can get a similar effect on an LCD monitor screen, in fact the manufacturers are allowed to sell them with a certain number of dead pixels. I would think in your case, if it is dead pixels causing the problem, that it was caused by the water effecting the electronics either in the sensor or the controller chips. If you can live with it, it's probably the cheapest option, a repair bill would cost more than the camera is worth!
nirofo.
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