Vintage Mac RAID, missing drives
Five year old desktop Mac with three drives. Every two years the Apple RAID card requires a new battery. The Genius kicked me out, saying they don't work on vintage Macs. A new battery was installed by a Mac certified repairman but now we can no longer see drive 2 or 3, the RAID array where all my files live. The OS mounts, disk 1 which uses a JBOD RAID driver despite having no need for a second drive (one can't install Mac OS on a RAID-ed drive).
As the drives in question can no longer mount or be seen by Disk Utility or Apple RAID Utility, etc. how should I proceed to find andrebuild these drives?
2 x 3.2 GHz Quad-Core Intel Xeon, Mac OS X (10.4.5)