When I re-interviewed at University of Cincinnati, the interviewer had not read my previous personal statement and seemed to know nothing about (nor care about) my previous application.
That said, definitely rework your PS. I threw my old one out and started from scratch, because obviously my "packaging" of myself wasn't working and didn't get me into medical school, so I felt like I had to try something different. So far it's paid off greatly (compare my 2005 vs. 2006 mdapplicant profile; nothing changed other than PS and timeframe).