decision: try and recover data myself as cheaper to do that and buy a new unit than pay a data recovery service then have drive replaced under warranty.
step 1:
remove the cover. lots of youtube videos searching for "remove wd hard drive". this was most helpful. https://www.ifixit.com/Teardown/Western+Digital+My+Book+Live+Teardown/26942
as you only have to work the 4 tabs and takes about 30 seconds. one side then the other.
rest of the disassembly is straight forward.
step 2:
access your data on the drive. I have a PC running windows 7 64 bit and used R - Linux. I had an extra sata port on my motherboard so hooked it up internal to my PC.
http://www.r-tt.com/free_linux_recovery/Download.s
my daya was in the EXT4 partition. see nfodiz post
http://community.wd.com/t5/My-Book-Live/R-Linux-help/td-p/541235
step 3:
recover files to another hard drive