Wiring diagram for Sony STR-1800

I have a Sony STR-1800 that has some moderate crackling when I adjust the volume. I assume that the pot is blown and want to replace it.

Does anyone have the wiring diagram or know the rating on the pot?

Pic of similar model (not mine)
s-l1600.jpeg
 
Flush with iso propyl alcohol, let it drain, then use a contact cleaner spray like 2-26 or similar.
I use the computer to change volume, as it feeds the amp.
Getting exact replacements may be difficult.
Try a manuals site, like hi fi engine, for the schematic, that is what you need.
Most of those sites are free, requiring registration.
Save the manual for future use.