A reading of -15v does seem very high for a -12v rail. The other readings all seem within acceptable ranges.

Not sure if it would damage an Amiga, but if the -12v rail is used specifically for the audio then that could explain your damaged A600 audio. But I'm not really an expert in the internal electronics of the Amiga. You need to get Zetro to answer this one to give you a proper answer.
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