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I've just swapped over the UDA1380TT chip from a fried board and it works! no more hiss.
The chip itself was difficult to prize off, had to lever it off with a knife whilst heating up the solder on the legs, the fried chip cracked when levering it off but the working one didn't crack so managed to put it onto the working board and all's back to normal.
*celebrates with an alcoholic drink*
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