The recovery firm has responded with some news, some bad, some good. The initial drive assessment determined that they found sector damage, partition corruption, filesystem corruption, and logical alignment failure. They provided an estimate for file recovery that probably exceeds our means at $4600 and would still require a lot of work to put back into place.
However during subsequent discussions with the engineer it has been suggested that cloning the drives would probably be a more viable solution. The good news is that cloning is less expensive and we would have a working partition, which would help get the grid back online sooner. They will need 4 new drives to accomplish this, and we have contacted our data center about this. We will be able to provide more detailed information, as soon as we receive it.
Thanks again for your patience and understanding.