I vaguely remember a Yamaha with bad binding posts. That's why I was suspect about the diameter size of the holes in the rear panel sheet metal. Otherwise...
Is Yamaha Canada sure it is a 1 piece part?
Because the diagram shows it is a 2 piece assembly.
The unit will need to be disassembled into bits and pieces so that you may access the Amplifier PCB underside where the soldering will take place.
So...
You need to remove:
- top cover.
- the back panel steel sheet metal piece.
- the smaller PCB above the amp PCB.
- the amplifier PCB take it out of the chassis.
That's roughly the procedure.
Keep in mind that the connectors are usually all different sizes and types although sometimes there are duplicates. That can make life difficult. So take lots of pictures to reference to and use a Sharpie felt pen to make a slash across the connector before pulling them apart. The odds of the slashes being identical on multiple connectors is near zero and so this is a good method for identifying the proper place to plug them together. Just a little slash with the felt pen and not huge.
... and then you can work the binding posts and remove them and resolder in new ones. Don't take shortcuts and try to bend the amp PCB while it is in the chassis and attempt to access the PCB solder points. That will maybe break stuff, cause a short on the PCB due to poor soldering due to poor visibility when soldering.
and... Enjoy yourself... Don't get stressed out and make a mistake.