Hi,Welcome to Just Answer, My name is XXXXX XXXXX forward to helping you today.
heres a video to help you remove and replace the CCU.
just click this blue link. http://www.youtube.com/watch?v=7XhyMOz7qxE
and here is a link to the part if you wish to order this on line.
clcik here there are no screws holding the CCU itself this is held by clips. the video shows you how to remove and replace it. hope this info helps you. thanks Bryan