actually the step motor assembly is easy to change and camping world usually has them, if your in a bind; Amazon has them much less money
but the plastic gear lock inside is damaged and its causing the motor to rapid cycle as it tries to lock up and shut off the motor.
mine broke the other way and i about broke a leg when it retracted when i stepped down on it
its a "genius" design
stepping on the steps before they reach full extension will or may cause the gear lock to fail
takes about 1 hr to change, 10 mm open end wrench and pair of needle nose or dykes and a few zip ties. also REMOVE power to step before you attempt repair. and make sure its full extended and fingers are not in pinch points