2004 Alphard 3.0L MNH15W transmission fluid 2 drains?

[MarkATH10W]

Hi all.  While working on my vehicle, I noticed that there appear to be 2 drain plugs:

 

1) drain bolt on the transmission oil pan

2) drain bolt on the very bottom of the transmission housing

 

If I am right about the 2 drain locations; this would mean we could potentaillly get most if not all of the transmission oil out in a drain and fill procedure rather than the normal 30-50% and without using a flush, or anything else more invasive.

 

Has anyone drained from the transmission housing?  Or have I mis-identified something?

 

Cheers,

 

Mark