Have Flyer by Lionel Gabe the Lamplighter, model #23780, manufactured in early 2k's. Pushing the red button makes Gabe climb the ladder smoothly. However, once he reaches the top, he will no longer slide down easily. If I just let him slide down withlout any motor assist, he falls quickly and smoothly. If I do the drop by the green button activation of the motor, he barely drops. Seems to be binding somewhere within the motor's workings. Hard to tell where the binding originates. Am I in need of a new motor, or can this one be repaired? Help.