try running it all the way OUT, first, and keeping the switch pressed even after it's finished, for several seconds - then try retracting it and see if it performs better.
you could also look at the rails, outside, and see if you see any metal 'shavings' that might be a sign of wear, or undue gear-to-track stress...
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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