try dvd codesearch on either av1 or av2 devices, but try searching by volume: with tv on:

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

To punch-through the volume to all devices:

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