Have a look at this Guide-
http://community.wd.com/t5/My-Book-Live-Duo/GUIDE-Debrick-a-MyBookLive-DUO/td-p/544860
It is quite lengthy and covers a few people’s experiences, including mine towards the end. Guide 1 deals with preserving data while restoring the operation of the NAS. Clearly, your unit is not totally bricked, but there are instructions for just about any circumstance. NFODIZ et al have done a great job of collecting information from many sources.
