2007 MDX - HFL causing battery drain

I was able to locate the issue of continued battery drain to the HFL unit in my 2007 MDX. Once I disconnected the unit I saw the mA draw drop from 238mA to 28mA.

1) If I replace the HFL unit does it require programming from the dealership?

2) Or, does it come pre-programmed?

3) Is this a simple repair?

4) Where, other than the dealership, can I purchase a replacement HFL?