[Kekoa]

I can't answer your specific question, but I can tell you that the Riders schematic for my 53-960 had a very similar problem.  The values and schematic for one of the electrolytic capacitors simply did not match what was in my (all original) radio.  So, I bought the SAMs schematic and it was spot on.  It perfectly matched what I was seeing in my radio.

I think mistakes are probably not uncommon, and cross checking two or more schematics from different sources may be your best bet. Anyway, good luck with it, and let us know what you find out!