Hi,
I've unfortunately had erratic gumbal behavior. I have completed all the repairs necessary to the tilt motor, but still have the erratic problems. In dealing with my issues I experienced your problem. The audible alarm you are hearing is an indication that your cable is either not connected properly or damaged. For example I had a 3 tone audible alarm and discovered the gimbal cable was not properly seated to the control board located beneath the silver cover on your gimbal. Later I had the same 2 tone that you are experiencing and it was because I unplugged the tilt board cable experimenting and trying to isolate which motor was at fault. So you might want to check those obvious connections. Keep in mind that the female receptors for these connections have a lock mechanism which needs to be lifted prior to removing or reinserting these cables.
good luck