Dale, thanks for this alert! We had noticed, while still at the factory, that each time we took our new coach out and returned or stopped elsewhere, that small service bay door was also hanging down. John affixed a piece of 1" wide by 1/2" thick weather stripping on the edge, which provided just enough extra thickness to meet the service bay door and keep the little door from dropping open again. We have since traveled over 5,000 miles and have not had the problem again.
After your experience with a flat tire, everyone should ensure that this little "trap" door is secured! This is a great heads-up.