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My dad left me an old Esso oil furnace, model GVU/EVU85A1 s/n 11165 manufactured by Gilbert & Barker of West Springfield Mass. It has worked in my garage for years after my dad died. But now I am having problems and thought I might find a book on this furnace. I did the google search but found nothing. How can I find literature on this old furnace and how to operate it or troubleshoot it.