Mic
plug has been replaced (new lav mic) so that leaves the mic
jack connected to the body transmitter. Corrosion is a possibility...
Radio Shack tuner cleaner
http://www.radioshack.com/product/index.jsp?productId=12784986but I think it's something to do with the mic jack on the transmitter. Some units solder these connectors directly to the internal PC board and after a while, the solder connections break. Have a tech open it up and closely inspect the input jack's solder pads.
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