RAID 1 will not mount

New to using the forum, so I appologize for reposting. The last advice was to use disk warrior, but before I buy, how will it see an un mounted drive?

Good morning.

I suddenly got an error that one of the two drives in my RAID 1 had I/o issues and should be replaced. I was in the middle of working on a wedding shoot job. I did a verify routine on both drives and they came back without any errors. I now cannot mount the RAID 1 as it times out. Slightly in a panic as I do not want to loose several days of edits, how can I get things back or transfer my data off the drive so I can finish the job for my client?