Ads with "Checkup"

I would use it as a way of reassuring a potential buyer that the amp was up to spec and had been checked out by the manufacturer.

Kind of like having a mechanic check out a used car. To make sure there aren't any trouble spots lurking below the surface. Such as a transmission about to blow.

So much can go wrong--some pieces I've had have been trouble free for years.---Some not so---. I figgure it had a problem and was cared for.--EVERYTIME I see this 'checkup' thing;I assume it went in for any other reason than just a checkup.But, hey I'm a suspicious kinda guy.---Oh, the guys that didn't send their piece in for a 'checkup'---They end up in the "disputes" colum.--'ya think?

In many cases,it's an item that is still under factory warranty to the original owner,but the warranty doesn't
transfer to the second owner.

It has been my experience that these ads often mean the product was recently sent in for repair and the owner has decided to sell the item.