I didn't understand exactly. This is already fixed with the new audio board or not yet?The RED audio board upgrade addresses two major issue, plus a couple of minor ones.
The big ones...
1) the headroom on the audio circuits was limited, so it was easily overdriven, necessitating a -10dB pad from most mixers' outputs.
2) when phantom power was active, noise was introduced.
So the board will fix those issues, but it doesn't get around the fact that a mic hooked up directly to a camera is not the best setup.