Raid 5 Configuration with Two Dead Drive Modules

I have a xRaid (14-250 drives) configured as a Raid 5 (raid 50). Two drives have failed, one on each side of the xRaid.
The Bad drives were pulled and new modules were installed. The new drives show green light, but when I retrieved data, the information is currupted. The New modules were removed and data was retrieved from the xRaid (missing the two drives) and the data appears to be okay. We are attepting to physically back-up all data on external drives.
What should we do to ensure best data preservation and how do we replace the dead drives. Thank You
xraid Mac OS X (10.3.9)

Thank you for your response.
The ADM are purchased as replacements. The xRaid is not iunder warranty (1.5 years old). They are the same 250 Gig configuration.
We have not tried to re-intall the new ADM's as we were concerned about the data, since they did not appear to be re-bulding them selves and we just 'sitting there'. So we thought that it would be a reasonable idea to performa a data back-up onto external drives...yes all 2+ terabytes. The back-up worked fine for about the first 1.5 Terabytes, but then the server would hang during the file copy process and lock-up the entire system. In looking further it has been determined that the system locks up at the same files (some 65Mb tifs) so I presume that the data is currupt.
The curruption of the data confuses me a little. We do have one dead ADM per controller side (one on the left and one on the right side) but it was my understanding that each controller could in theory loose one ADM without loosing data....
Also, the xRaid does Not have the Latest Firmware. Should we update the firmware while trying to get this system back into a healthy condition or should we wait until we get all ADM's back up an going prior to firmware upgrading?
Thank You

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