[Q] Sony xperia s loudspeaker problem topic

Hello! i`m facing with a terrible problem with Sony Xperia SL (LT26ii). Basically it fell into large amount of water, i managed to dry it, i cleaned motherboard with alcohol and right now it is working just fine except loudspeaker. When i `m opening walkman i cant hear anything but when i put my phone close to my ear i can hear there is quit music coming out from loudspeaker. And that's also going for ringtones, notification sounds and so. When i plug headset, it is working just fine. I already tried to put new loudspeaker but the same problem. Already re installed firmware and tried headset fast plugin/out method. I`m wondering what would be the problem?