Lizem,
You don't need access to the other board for this application. I've tried to remove the board in question and it's a pain in the a$$!
What I would do is just resolider the switches and temp pot in the box without removing anything else. Then I would plug it in and see what happens. BTW, if you suspect the aux pump i would take it apart and see if there is a problem. Only takes an hour at the most. Keep us posted!
Adam