So I spent a little time working on the Sony problem with the mute. I used a heat gun to warm up various boards, and I found that when heat was applied to a very localised spot on the digital board, it burst into life; only to retreat into silence again a few seconds after the heat is removed.
The issue seems to be either cold joints or an oscillator. So I've replaced the oscillator crystal, and resoldered the cold joints. There's a small repair to the PCB as well, since the removal of the old piezo took a bit of track with it. (cheap PCB). Fingers crossed ...
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