Warranty Claim for potentially failing Drive

Within the last few months I upgraded my NAS from a 2 drive mirror setup (set up in March 2015) to a RaidZ1 setup by adding a third HDD (all three drives are WD Red drives 3TB ea; the newest drive is called a WD Red Plus). On 30 August I received an email stating:

Pool nasdrive state is DEGRADED: One or more devices has been removed by the administrator. Sufficient replicas exist for the pool to continue functioning in a degraded state.
The following devices are not healthy:

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I...

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