Electone E-50 from a dumpster – lil’ help?

Chris writes in looking for a bit of help for his dumpster procured Electone E-50 –

I found this Electone E-50 in a dumpster, and it mostly works! As you can see, the pedal board is missing, but the metal tabs that allow for interfacing are still there. Anyway, I want to hack this thing out. Does anyone have any ideas on what I should do with it?

Also, if anyone knows where a user or service manual for one of these exists in PDF or something, post it! It’ll probably make figuring out what to do with it easier!