Hard drives go bad or have issues that prevent the My Cloud from operating properly with is typically what causes a front red LED. Or are you saying that you believe WD intentionally caused a problem with the drive causing the front LED to turn red?
Does the My Cloud obtain an IP address from the network router (DHCP Server)? One can usually access the network router’s administration page to see what IP address it is handing out to devices. One can see if the My Cloud is obtaining an IP address from that router. Or one can use a network scanner program to scan for IP addresses on the local network to see if the My Cloud is showing up.
As a last resort one can extract the My Cloud hard drive from it’s enclosure and connect it to a computer using a USB to SATA adapter for 3.5 inch hard drives, or a USB to SATA docking station, or a spare SATA port on the computer. Because the My Cloud hard drive data partition is formatted for EXT4 one will have to use either Linux or a Linux driver (if using Windows) to view the contents of that data partition and copy data off it.