Extended test Error

I have four (4) WD 4.0TB in my cloud EX4 that I have test using WD LifeGuard Diagnostics and I got the following results below: Is there any solution for me to able to fix the HD?
Thanks,

Test Option: EXTENDED TEST
Model Number: WDC WD40 EFRX-68WT0N0
Unit Serial Number:
Firmware Number:
Capacity: 32006.30 GB
SMART Status: Not Available
Test Result: FAIL
Test Error Code: 08-Too many bad sectors detected.

Seems like the drive has gone bad.

You can replace the drive through by following the steps given in the link if your drive is under-warranty.