Front door steps, when opening front door appear to attempt opening but don't move. Orange light comes on, and you can see the motor engaging the gear, moving it slightly. Closing the door, motor reverses, gear moves very slightly, motor stops, light goes off. I am assuming controller good. I oiled all pivot points and tapped with hammer. I see 4 screws to remove step, 2 however recessed over step between step and inside step, tough to reach. Is step binding, motor bad, or possibly bad controller? 15 year old coach, purchase new steps? Thanks for your assistance!