While you may be out of stroke, I've had a similar growling noise if the redwood has been sitting for a while and I haven't lubed the legs as is mentioned somewhere in the manual. I find that putting the system in manual and exercising the offending leg(s) up and down helps. when moving the RV every day or two on the road I don't get the problem.
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2013 Redwood 36RL, 2011 F-450, Sat Internet, Sat TV
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