I have a Denon AVR-3803 receiver. I can not get into the system setup menu. All other functions appear on the screen from the monitor out as they should such as volume, tone, etc, but when I press system setup on the original remote control for the unit which is the RC-921 remote, the system setup does not appear on screen. I thought it might be the remote because the volume up and down stopped working. I downloaded the codes for the unit to a jp1 remote, and all the codes including the volume up and down work perfectly, but the system setup does not work. I did numerous initializations of the receivers microprocessor as per the manual, and I still can not get into the system setup menu. Any thoughts. Thanks in advance.

Brian