I'll be flying PDX-SFO-IAD on July 20th on a full Y fare. PDX-SFO cleared as an instant upgrade immediately after ticketing, and the SFO-IAD leg currently shows F4, so I was thinking I should throw an RPU at it if I want to have any chance (however small) of clearing that leg. Will the fact that my first leg has already been upgraded cause any issues? I don't want to apply to RPU, fail to clear the second leg, and then have the RPU still count as used since the first leg was upgraded already. Should I call in and ask them to apply the RPU to just that leg? Any thoughts on whether a Platinum on full Y has a chance of it clearing on a 4pm Friday hub to hub flight?

Thanks for the help. This is my first time using RPUs, so just trying to make sure I don't make a mistake.