3 Red flashing lights

[aggs]

Greetings

 

I have a Buffalo Link Station Pro Duo LS-QVL recently the front panel stated to show 3 red flashing lights just under the power button. I have 4 x 3TB seagate hard drives in raid 1 all showing green light on disk information. I can still access the drives on the network and backup schedule still runs okay nighlty I have tried re booting the device, also shutting down the device and leaving for a few hrs before re starting but no joy. Console simply shows Error in Array 1.

 

Any help would be gretaly appreciated. Thank you