That is what I did I took out cpu of known good unit. That is where I traced problem too. When I did bad unit then worked properly. So I had CpU rebuilt. When I put new cpu in to the lift that was good before since I left CPU from it in the original lift that was giving me problems. Now the lift that was good now has developed a problem with fans not coming on. There is a small voltage showing at the fan not enough to power them.
Even with brand new fans issue is still there.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.