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Mr Sizzle, Just in case they say that, perhaps it was condensation or rain
Mr. Sizzle welcome back to the forum
http://talk.sonymobile.com/t5/Xperia-Z3-Z3-Dual/Re-There-sizzle-in-the-top-speakers/m-p/907593#M5738
has your phone been in contact with water at all?