Curt,
That looks bad.
Either the worm shaft is bent (that would explain one sticky spot) or the worm is damaged (couple of bumps on threads) or (less likely) you have hard particles/dirt in grease which are now pressed into worm surface.
Is this happening at every position of the worm gear (I know.. you have to turn it 140 times to find out. If yes, at least you know the gear is OK)
Anyway, all this will result in increased periodic error,
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