You can obtain the Yamaha codes for all of their amplifiers and receivers from the Yamaha USA website. You can use a tool called "IRTool" (in the Pronto files section) with the device/command information from the Yamaha website to generate Pronto infra-red codes. You could create your own CCF (via ProntoEdit). It's a long way round the houses but you guarantee a set of noise-free and accurate codes, many of which are discretes.

Alternatively (and more easily), locate any Yamaha RX-V#50 CCF from the Pronto section and you will find that the basic code sets are the same (on/off/volume etc).

If you search the Pronto forum there are a number of long-running discussions on Yamaha codes.

Hope that helps...