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OT: Current_Pending_Sector on /dev/sd?

I have a raid6 with 4 disks. 2 of them show Current_Pending_Sector 1.
The disks has warranty till Apr. 2019 so I decide to replace them.

After I change the disk and install it on an other computer to overwrite
with zero it the Current_Pending_Sector is gone.

What should I do? Whats our experience?

Best Regards,