Well, your transfer bus #2 is powered by GEN1, so it won't be working, but check and see if DC bus2 isn't powered by BAT bus? And as for bleed valves, regardless of how they're powered, they'll stay where they were meaning open, and the airplane continues to be pressurized. As long you don't change altitude you pressure difference stays the same. (although you might have to descend to get a better APU start).