External RAID0 won't mount in Finder or Disk Utility

Hi everyone,
Thanks in advance for any help you can provide.
I have a Western Digital Passport RAID0 that I connect to my 2008 Mac Pro via Firewire 800. It has worked for years. I switched out one of the drives about a year ago after it went bad, but when I did that, Disk Utility was still able to see the two separate drives when plugging it in the first time after switching them out.
This time, when the RAID0 wouldn't mount in Finder, I opened up Disk Utility and neither drive showed up. So I opened up the enclosure and tested both drives in a USB dock. One mounted fine, the other said it was unreadable. So I set the unreadable one aside and switched it out with a same-size replacement drive that I had partitioned as MacOS Extended Journaled (non-case sensitive) with GUID partition table (same as the other drive and all drives on my system).
Reassembled the enclosure and plugged it back in. Still, neither drive is recognizable by Finder or Disk Utility. Verified it has power and that the cables are seated correctly. I also tried USB connection just to be safe.
I do not believe the RAID controller in the enclosure is bad—at least it seems very illogical that a drive and the controller would fail at the same time, as I have it well protected against power surges.
Any thoughts as to something I may be missing or known issues? I upgraded to Yosemite at its public release but successfully used the drive between then and now.
Thanks again!

Eric, nifflerX and nbar:
That's what I was afraid of.
Thanks for your help.
Stonely

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