MarkAnne, I had the same problem a couple of years ago with the step motor making 4 or 5 knocking sounds when it operated. A replacement motor solved the problem. Here's some information I posted about it back then. Hope it helps:
The motor used for the Lippert steps on the Georgetown is a Ford and Lincoln power window motor. They are available from Car Quest, Advance Auto Parts, O'Reilly, etc. for about $50. You will need to cut and reuse the electrical connector off the old Lippert step motor, as it is different from the Ford connector.
Two manufacturers available:
ACI part # 83694
Cardone part # 42-309
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2010 Georgetown 373
2013 Jeep Wrangler
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