That's pretty awesome that you were able to clean the corrosion and it worked. I also had the dashboard craziness happen to me - I accidentally got water in the dashboard and the same thing happened to me. I did see a SOS malfunction first and then later even a steering wheel lock issue.
After some time - I only had the SOS and no audio issue.
Later I took apart my dash - unconnected all the wiring to radio and dried out the inners. Cleaned the connectors with contact cleaner.
Car starts up just fine today with no problems with audio.
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