Just thinking aloud (PA is probably the swing state I know the most about outside of MI due to family reasons)... there's evidence (in district polling) that she's could improve in the Lehigh Valley (ie. Allentown/Bethlehem/Easton area) and in South Central PA (ie. Harrisburg Area). Suburban Philly and Pitt likely trend left as well.
If all true, Scranton/Wilkes Barre is one of the best places to make up ground if you are losing raw votes elsewhere. If you aren't making up ground there, there aren't a lot of areas left; you have to make it up either in "The T" (ie. Alabama in the Middle), NW Corner (ie. Erie area) or via Urban PA (ie. Inner Core Philly/Pittsburgh, either collapse in turnout or an epochal shift in vote behavior).
Not saying any of those things cannot happen or that the district level polling is 100% correct, but it's something to think about, and partly why PA tends to get lumped in with MI as being one of Harris' more favorable states at the moment.