Although there are no service manuals or reprints available which cover this player action, Stephen Kent Goodman has written an excellent treatise that covers the identification of the system. He also goes on to explain how to remove the stack and offers sound advice with regards to the rebuilding of the valves. To access the Eastonola web page, click on the link below

Removing the fallboard assembly, the name "Eastonola Minor" was decaled on the upper deck of the two-tiered stack; a stack of less common architecture than usually found (illus. 1).