I have the same problem on mine, a 2004. It's a known problem without a great solution. I found a used 215 on Craigslist with a mic cord in better shape than mine and I tried to solder a the better cord onto the plug and failed utterly. Wires were too tiny and my skill level with the soldering gun couldn't make it work. I did check the measurements for a new Raymarine radio and the new one would be about 1/2 or so larger so cutting would be needed. I haven't had a chance to see if I have the extra space as yet so I still have the crumbling cord. The PO did a pretty good job of wrapping it with tape so there's no bare wires. I don't want to spend the $$ to replace both of them and I also don't want to lose the capability the current setup has to use the radios as intercoms from the bridge to the cabin and vice versa, so I'm going to roll with the status quo for this season, I think, and see how it goes.