I was able to find the step originally on your 1989 Winnebago wnc23. It was the Kwikee 3218 which unfortunately no longer has any replacement parts available. You will need to replace the entire step assembly as replacement parts are only available for 1999 and newer steps at this time.
Since you have a 2 step assembly, I recommend the Kwikee # LC372261 if you have 24 inch wide steps. There are many different sizes regarding step width, mounting bracket size, rise/drop of step, etc,... view full answer...
From what I could find given the part number you provided. It comes back to a Power Gear slide-out motor. The correct replacement slide-out motor for a Power Gear 13-1119 is the Replacement Gear Motor Assembly for Lippert Electric Slide-Out # LC386322. view full answer...
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