Greetings,
Thanks to all who replied. Here's the current status. The good news is that the problem is gone and has been gone for some time. We are traveling again and the stairs are functioning normally again. The bad news is I have no idea why it started blowing fuses or why it stopped.
All I know for sure is that I poked around anywhere i could, looking for the problem, and it stopped. I'm sort of waiting uneasily for it to start blowing fuses again.
Related comments. Clay is right. Kwikee is alive and well over at Power Gear. I even posted a question at their site and got a quick, useful reply. I emailed the question on the weekend and Monday morning early had the reply. At that point my problem had disappeared so I haven't applied any of the general troubleshooting suggestions.
Thanks again for the help,
Bruce