There are some minute notes in the CCF itself. The way I figured the stuff out was playing with the Home Bank and Volume Bank IR codes against my own HTR5280.
There are no other docs. However, I might suggest that you visit the Files Section and download Andrea Whitlocks Yamaha Extended IR package as it documents the IR code and functions for all Yamaha receivers.
Andrea has done a great job of pulling this together (like she ever does bad work. LOL).
