Took the RV to a Ford dealership and they found the issue. There are contacts under the passenger seat with a Honeywell alarm system. When the emergency brake is released the alarm will sound if the contacts are too far apart. One contact is screwed into place while the other is attached with velcro. The contacts can be easily pushed closer together if they have separated due to vibration or swiveling the seat. I will contact Winnebago about a better solution but at least the source is known. Hope this helps anyone else with a similar problem. Thanks for the suggestions.
Greg