AE stands behind their stuff! I had the original RC8 with the bad tanks I went through four before I found a good one. I called AE and told them I went through four tanks and a week later I had four brand new tanks no questions no old tanks needed.
For example I ordered a JP4 pipe and it came with a hairline crack in the manifold bend which was leaking oil. I called Ofna faxed them my 3 day old receipt and emailed them a pic and they told me they needed the old manifold before they could get a new one out to me but I was going to Motorama in 2 days.