hifi engine

manual serveice sansui model 2000

I want the manual serveice sansui model 2000 to repair my sansui.
Who has manual serveice sansui model 2000 not 2000x or 2000A please share to me?
My sansui has truoble with volum and balance.manual serveice sansui model 2000.
thank you
surajit D