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Interesting you should mention that. And indeed exactly where I'd first be looking. Although I've done some SMT audio I've kept certain key parts leaded - including electrolytics.
What size output cap did you have in mind btw ? The audiophool couldn't have fixed that one anyway since his advice was to leave SMT stuff alone.
Haven't seen a muting switch in such stuff in ages. It was popular to persuade a bipolar transistor to do the job. Just don't apply more than about 500mV rms across it !
Graham