Normally we ask to have the system sent to us to be sure the PSU was at fault, if so then yes.
Seems like the length of time it would take to do that + labor would justify the cost of replacing the PSU in the first place. Plus, if it was the PSUs fault, then you're really in a bad situation if this happens frequently, having to replace the PSU also (with CWT Antecs I'm sure it's very frequent