First, look up the diagram as Sears PartsDirect - there are four screws (2 are labeled #16 on the diagram).
Pull off the bag/accessories cover (#36) by lifting it completely out of the hinge to get to the first two.
Pull off the power switch/cord return pedal (I stuck a screwdriver underneath it from the back and pried up) and you'll find the other two.
Kevin, April 2009