Thanks JorgeB, just did a bit of reading up on the CRC Error count, and you're on the money, I'll be swapping the motherboard out shortly so will swap out the cable to the drive also. In the past 8 weeks it's only increased by 2 so nothing major. I've also checked the other drives and the remainder have only a max of 2 values recorded. Perhaps I was a little quick to panic 😁