Don,
The biggest issue with series 42 steps are the ball bearing slides they use to extend the steps. Even though they are rated for 200 pounds, they were never engineered for an exterior hostile environment. I have used compressed air to blow out road grit and debris the best possible while cycling the step in and out. Be patient because it will get worse before getting better. If you can't find the Kwikee lube, use motorcycle chain lube after you have cleaned it best possible. Series 42 were discontinued by Kwikee but maybe Lippert brought them back? Hope this helps, Fred