LEDcode 223 means it can't find a valid boot device.
On those old machines you also got an alternating LEDcode 223/229 if the SCSI bus was not correctly terminated. So maybe check SCSI cables and/or terminators first.
In service mode boot, what CD are you booting from?
Also you can to try an put the remaining disks in another server and try to force-import the rootvg as another VG "oldroot" or sth. - it will complain about duplicate LV names and about a missing disk but you might still get at your data. You might need to create a new jfslog though, because I fear that the jfslog was also on the crashed disk and is well and truly dead by now...
HTH,
p5wizard