Answer: No logical explanation is coming to our minds. If you can contact the manufacturer or a dealer who might have insight, it is worth a shot. You can try tracing the lines under the dash to get try to disconnect the light, although that still leaves the nagging question of why it when on in the first place.
We are posting this for others to comment.
You may also want to look for a Holiday Rambler forum or owners group to ask the question. Perhaps these website will help:
Comments and help appreciated for this post.