Well Sony called me back today, and told me basically that the remote that comes with the STR-DA50ES sends out frequencies that are to high for the RM-AV2000 to learn. In short they told me I was screwed, and that it would be noted by Sony, and forwarded to engineers.

So if anyone else has had this problem, your basically out of luck. The RM-AV2000 is still a very good remote, and I will probably keep it since the remote that comes with STR-DA50ES is worthless.

Chris