CRUCIAL STEP: I messed this up the first time I reassembled this nearly broke the gearing and generated an error 8

Error 8: I think is failure of the brewgroup to home.

Place lower portion with the white gears at the top of motion inside the cylinder

then slide in upper portion with the red o-ring then slide both together to the bottom

I put a little vegetable oil with my finger on the inner cylinder wall other wise it was super dry and hard to move.