I used an expiring 2014 DSU for a 4-night stay in March 2015. Do you think they'll let me use that same expired upgrade if it's just a 3-night stay (i.e. 3 of the original 4 nights)? To clarify, I'm booked and upgraded March 28 thru 31. I want to leave on March 31 (i.e. use only 3 of the original 4 nights).