Perc5 & MD1000 lost RAID config

We have a PE2950 with a Perc 5 controller connected to two MD1000 units, each containing 12 500Gb SATA disks.

Last week, we had a power "blip". This caused one of the disks to die; it has been replaced.

After the "blip", we have also lost our entire RAID configuration. One MD1000 unit reports that all physical disks are "Ready" and the other reports that two disks are "Online" and the rest are "Ready". According to the controller, there is only one RAID-5 virtual disk set up consisting of the two "Online" disks and three others. This is clearly wrong.

We had thought to retag (but not initialize) the disks, but the system was installed in 2007 and we don't know the exact way RAID arrays were set up (all we know is that there was 7.2TB of usable space total). It is possible that each MD1000 has two RAID5 with a hot spare or one RAID5 with a hot spare (or something else along those lines). Is there any way to find out the original configuration? [We have run the DSET but it provided nothing.]

Any idea why most of the disks are reporting "Online" rather than "Foreign"? Any suggestions on best way to attempt recovery? We understand that each disk should have information about the RAID array it is in - where is this information stored on the disk?