Use a Zune opening tool to very carefully bend both plastic clips along the top edge of the Zune away from the inner chassis while simultaneously prying the respective side of the inner chassis up off the front case.

Once the top edge of the inner chassis has been released from the front case, separate the clips along the right edge of the Zune.

Lift the inner chassis off the front case, minding the digitizer and display ribbon cables routed through a slot near its center.