aka he broke it, do you really want to buy a 16 year old machine from somebody who tinkers with stuff they shouldn't??The current owner says that he mistakenly let the gas out of the tube while doing some curious exploration
Many far eastern tubes cannot be serviced so assume you are going to need a new tube. It also begs the question why was he tinkering? was something not doing what it should?
Truthfully? that alone would mean I wouldn't touch it with somebody elses 10 foot pole.