Well I am impressed! I emailed Ford and got a response the next morning. It asked me to call "Motorhome Assistance Center: 1-800-444-3311". I did just now and got a nice chap who took my information but said a tech needed to address it. They were all busy and one would call me right back. Sure, I cynically thought. He did in less than 5 minutes!
He asked many questions. Bottom line is if it were a F53 alarm, the instrument panel would show it also. I'm sure its not a CO or smoke alarm since mine are way back and there have been no beeps since we parked. I'm back to wondering if my electric jacks are the culprit since it sounded like it. Its done it before when one might be slightly down but the jack control panel would also light up---it did not Monday.
So, we'll see if it does it when we move again in 2 weeks. Thanks for all the suggestions!