You can try to searching for the volume commands, then you will know for sure if theres a working code:

with AV receiver on:

1. av1 or av2
2. press and hold MUTE & SELECT for two blinks
3. enter 9 9 1
4. enter 3
5. press and release VOL UP
6. point the remote towards the av receiver and keep pressing & releasing CH UP key, if and when the volume changes
7. press SELECT to lock in code

To get the volume commands and punch it through to other devices:

1. av1 or av2
2. press and hold MUTE & SELECT for two blinks
3. enter 9 9 3
4. press SELECT