I have don't know why it's just in one spot.  If you like puzzles you could look at the layer view and run through the order of where it starts printing first on a layer or after a long "travel" move and there's a good chance the bad areas are underextrusion just after a long travel move or are the start of the layer (in which case a prime tower would help - check the "prime tower" box).   But pretty much any PVA issue is improved by drying the PVA.  So consider doing that: 1) In