I would love to help, but most tuners have specific instructions how on to proceed. The general standard is to tune first, then remove the components. Have you reached out to SFT for instructions? I know we have some Sofa King customers here, maybe they can help...
Most aftermarket warranty companies will say anything to get out of a claim. They might be right, but I would fight it like no other. That's why I hate them.
It's honestly a crap shoot! But, if you can financially recover for a bad failure and you feel like it's a nice buy, then do it. They are nice smooth rides.