Well I started to pull the foam out and found the leak very easily. The foam was actually holding this pipe together, as I pulled it away water began to rush out of this cracked pipe.

It's in a very difficult to access area, and some of this foam is really attached so much to the inlet/outlet piping that I can't imagine being able to fix it. But I'd sure like to try.

Does anyone know where I could get a plumbing schematic so I can try to determine what part this is, what it really looks like, and where all the connections are?

This spot was adjacent to the filter assembly. At first I thought it was the filter assembly, but it's actually 3 or 4 inches closer to the center of the tub and there are definitely some tubes coming in and out, but it's so tight in there it's hard to really tell where one thing begins and another ends.

IMG_20151123_185625512 copy by John Bixler, on Flickr

IMG_20151123_190209029 copy by John Bixler, on Flickr

IMG_20151123_185620435 copy by John Bixler, on Flickr

IMG_20151123_185603247_HDR copy by John Bixler, on Flickr

IMG_20151123_185557281 copy by John Bixler, on Flickr