Korg Poly800/EX800 Users

hell everyone,

a guy in town is offering me a poly 800 for $40 (canadian). the thing
is, the audio apparently goes in and out from the 1/4 inch output.
here's what he said:

"well here's the thing. it works sometimes and sometimes it doesn't.
sometimes you have to jiggle it, sometimes you have to turn it off and
back on and sometimes nothing comes out at all...i had a guy at
songbird [local vintage instrument dealer] look at it and he said it's
definitely the output, there's nothing wrong with any of the circuit
boards or anything."

Anyone worth experience deal with a Poly 800 like this? I am handy
enough to resoder things if need be, perhaps even capable enough to
install a new 1/4" output, but that is probably where it ends. Will it
require anything more than a simple resoldering job, or could it be a
much more serious problem?

Anyone know where i can get a service manual?

Should I just get it anyway for the $40?

Thanks so much!

_ Peter