Will manually rebuild a degraded drive cause more problem?

Hi, one of my drives is degraded. I’m thinking about trying my luck by manually rebuild it.

would it make thing worse? Thanks.

damnit. now both drives also degraded before i can do anything. but folder is still accessible.

RAID rebuild is the process of reconstructing RAID array in the event that a hard disk drive dies. RAID rebuild puts every data into its proper order keeping a copy of the data in the event that a hard drive mechanical failure happens. Once RAID rebuild takes place, data is reformatted with parity data & RAID algorithm.

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If you’re already versed in the general failure process, you can skip ahead to how to replace a drive and repairing the pool.