pilotsfor911truth.org/p4t/AA77_Raw.zip (external - login to view)
The part you will be looking for is this.
"The status of the door to the cockpit is checked every four seconds throughout a flight and relayed as a simple 0 or 1, where 0=closed and 1=open, with approximately 1,300 door status checks performed during AA77’s 90 minute flight. Every one of those door status checks shows as a 0, indicating that the door to the cockpit never opened during the entire flight."
RockCreekFreePress Articles (external - login to view)
I would be happy to give you the link to their forum so you can 'tune them in'.