Scott...I did a parts search on HP's website:
http://h20141.www2.hp.com/hpparts/Se...7TMKU5C2SSF2X0
I appears the part you are looking for (407674-001) is available directly from HP for $95.00.
I'm not sure if it is something you could install yourself, or if you'd need a tech to do it.
Good Luck ^