No idea, but my 7705 lasted just over five and a half years, and finally blew up spectacularly and could have done a lot of speaker damage, if my speakers were not really robust.
The 7706 has had problems after four months. I have to feel that Masimo were not good stewards of Sound United and were likely penny pinching to a fault and shopping in the cheapest markets for components. The other issue is that both these units were made in Vietnam and may be their factories are a grade below China. One of the reaons I have ordered an AVP 10 is because it is made in Japan. They have a good history of quality electronic construction now.
I look to keep my gear for the long term. I have working units in the system over half a century old, and they sound really good. You would never know it if you heard them.