I have been having similar issue and find that hitting motor with hammer and spraying with good lube seems to work most of time. The stairs seem to always work fine in my driveway but after driving a few hours, they will not extend yet the step light comes on. I can hear the override with the ignition switch working too. I have found nothing loose. I have pulled out cotter pin and tried to pull out to no avail. Sometimes hitting it works and other times, I leave it alone and it then magically works. I really think it is a heat issue since exhaust pipe runs right behind the steps. I recently insulated all wires and tied them to the underfloor so we shall see how works on next trip. Most frustrating problem since comes and goes for kiwi 2 step model.
