Storage Space with warning: "Reduced Resiliency"

I use a 2 disk mirrored stoarge space in WIndows 10 (1903) for the destination of my TIH2018 tasks.
This morning while some scheduled TIH tasks were running I started to get read error warnings from the task.
Upon checking the storage space I see a Reduced Resiliency warning on one of the drives in the pool.
The drives are identical and have the same descripition so I dont know which of the two has the problem.
Without removing the drives is there a utility that can tell me which one its is?
Thanks for your time and any info.
B R
.

Thanks for the suggestions Steve.
Had a look in Event Manager but cant find anything relevant so far.
Looking for a disk health checker from the drive maker is a good idea. WD in this case.
I just checked when I first set up these WD 4TB Red Label drives as a mirrored storage pool and they've been happily running for 6 years without a squeak. So that aint bad at all.
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6 years for the drives sounds very good as 4TB drives must have been fairly new at that time! I have seen much younger drives die without ever getting beyond 1 or 2 years!
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Acronis Links : Acronis Scheduler Manager : Acronis VSS Doctor : Backup Archive Compatibility : Cleanup Tool (ATIH 2010-2019) : Cloning Disks : Contact Acronis Support : Difference between Backup and Disk Clone : MVP User Tools - Google Drive
MVP Log Viewer & MVP Custom PE Builder available from Community Tools page.
Acronis True Image User Guides available from Product Documentation page.
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Cannot add anything to what Steve has said. A remote possibility is that there is a loose connection or that the SATA cable or power cable to the HDD is failing. I have seen the former from time to time, the latter very rarely.
Life span is good. I have a WD AV drive which has spent most of the last 9 years in a video recorder and it is still going strong … no indications of possible errors. I have WD Red 4TB drives in my NAS purchased on 4 February 2015 which are still going strong. Also have 2 WD VelociRaptor 600gig purchased in May 2012 still going storng (the third one failed a few years back).
Ian
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Synology DS414 NAS 4 x 4TB WD Red HDD
Acronis Links : Acronis Scheduler Manager : Acronis VSS Doctor : Backup Archive Compatibility : Cleanup Tool (ATIH 2010-2019) : Cloning Disks : Contact Acronis Support : Difference between Backup and Disk Clone : MVP User Tools - Google Drive
MVP Log Viewer & MVP Custom PE Builder available from Community Tools page.
Acronis True Image User Guides available from Product Documentation page.
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