Most of this is from  organ-iser, but I figured out the last part, mostly... I'm a noob so play around with it and see if it sounds right to you

organ-iser part

4  3  4  5  4  7  -8  7  6
-6  6  -5  6  4  -5  -4  4  -4
4  3  4  5  4  7  -8  7  6
-6  -7  7  7  9  8  -8  7  7

2nd part

6 7 6 -5 5 -4 4

5 -5 5 -6 6 5 4

5 -5 5 -6 6 5 4

then transition back to the main theme.  there is some different playing around that can be used to fix, but I came up with this on the fly.