Air Venturi Avenger made a loud pop and leaked all the air.

If it popped and then began leaking down, more than likely the burst disc went. This happens sometimes, pretty easy to swap out. Just make sure if there's any debris in that area, that you clean it out.

 
This gives me a place to start. I ordered a burst disc and will start there. Thanks to everyone that responded.
Well the new burst disc came and I put it in today. Filled it with air and no leaks so far so thats what it was. Just going to leave it sit overnight to make sure she doesn't leak. Thanks to all of you. Gary
 
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