Seeburg S100 Tormat questons ( my first tormat )

Hi everyone, I just picked up a Seeburg S100 Phono Jet jukebox.

I have a question on the tormat system:

When I make a selection,sometimes it will make random selections of
other records. Also wont play the "B" sides sometimes, or just the
wrong the wrong selection.

Sometimes it works OK.

What or where should I start? Nothing has been done to the machine, as
far as I can tell.

Could this be a selection button problem(dirty contacts, etc..) ?

Thanks for any info on this. Dennis.