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Sanyo 4-channel receiver manual

I notice that there is no manual listed for my mid-70's Sanyo 4-channel receiver, the DCX 3250K. Nor any other Sanyo 4-channel receiver either. I believe there were at least 4-5 models?
If anyone has a manual for this unit I would very much appreciate a copy or downloaded version. I have lost mine. I bought this unit in 1975 or 76 in Coos Bay, Oregon. It is a 250 watts RMS unit that looks very similar to a vintage Pioneer receiver. It has been performing almost flawlessly for over 45 years but it is now time to revitalize it with new lights and fix a possible amp flaw (causing some hum) in one of the channels.