In what way are you trying to get it back to RAID 5?
Is the OS totally lost? If you wiped all the drives, that complicates things considerably.
If you have a bootable unit, it should be fairly simple.
jrregan : The power supply on LS-QV is an external brick, is that what has failed? Also, TS5800 has a 3 year warranty with phone support included, and should be 100% supported by the support team.