Larry,
You may want to identify what kind of leveling system you have so that others with the same system can help. I think it is the SMC hydraulic system that has rams that are over the axles that do not go to the ground. If that is the case, the faint buzzer (which my wife can hear from the passenger seat and I cannot hear in the drivers seat :-) indicates that the jacks are not all up. If you hold down the manual retract the buzzer should quit after all the jacks are up. Depending on how far they are extended at the time, it may take a bit of time for the jacks to fully retract. You may hear this alarm while driving also. As the fluids warm up while driving during the day there may be some expansion moving the cylinders down slightly. A brief activation of the manual retract button brings the cylinders back into the fully retracted position will shut off the alarm.
Later Ed