My concern is that your contact does not have a clue what he or she is doing or is trying to overcome a fault that they are aware of. Vienna has stated the correct settings when using ML, which is the proper way to get the 3000 working with the 9.
What may be worth looking at is the Speaker Type and Speaker Role settings in TV - MENU - OPTIONS - SOUND. The 3000, when connected by ML and activated, will automatically default to SPEAKER 2 (or SPEAKER 4 etc if you have over-ridden this setting).
Check that all speakers are identified correctly, when you say 'not working' do you just mean no sound? Hence worth checking the above.