Thanks, WD did contact me back after I sent them a faebook message.
I have sent them details and the report from the drive but still no solution offered as yet, if I don’t get a response soon I will try one/both of the following…
A restore without (hopefully?) wiping the drive… [GUIDE] Fix Dashboard Errors 3xxxx using… /usr/local/sbin/factoryRestore.sh noreforma
Or fsck /dev/sda4 to check the HDD which is detail in this post Data Volumes failed to Mount?! - #6 by nfodiz