I did exactly this a couple years ago-with a ticket from 1987. Just went through the turnstile. There was a CM at any FP machine I went to to override it and print me out a FP. But it may not be so easy now-I heard talk about cutting back the various nos. of CMs working, but when we went last month, I think all the FP machines had CMs there. Just watch out for those CMs! The second time I went to get a FP, the CM told me, very straight-faced, that I couldn't get a FP since my pass was from before there were FP machines. He was only teasing me, laughed when he saw the look of panic on my face. But initially he did such a good job of convincing me he was serious! And those passes make such a great conversation piece with the CMs at the front gate-they love to see how much it cost "back in the good ole days"