I live in Australia. My Variax 300 has a dud piezo on the B string. Physical connections to bridge and internal board are live and OK, and there’s a very faint signal, but we can’t get the volume the same as the other strings. The diagnosis from my electronics engineer friend is that it’s most likely a dead piezo element. Google, Amazon and eBay searches for a replacement have proved fruitless. Can they still be obtained, and if so from where? Any help would be most gratefully appreciated.