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Possibly, but 2 volts extra shouldnt dshouldn't do much. I'd wager that most components (even I'm cheap dodgy stuff) will be over specified because it's cheaper to go for the mass made stuff that's readily available than it is to get something that exactly matches your requirements.
Tell that to the speaker amp I just repaired. Quote:
If 14v would kill it, I'd wager it's got a fairly limited life on 12v anyway.
Or maybe it is old and just can't handle it any more. Surely you've replaced a motherboard at least once for failed caps?