OP here. I was on the phone over an hour with this issue and had I not been on the DIS reading about what everyone else was experiencing I would have had even more trouble.
The first person I talked with, Kathleen from IT was adamant that the Mine Train would be closed all day and she could not/would not switch my fps. When I told her I had
MNSSHP tickets for that night and was concerned about still attending the party if that ride would be down she was going to pass me to guest services to see if I could change my party night. When she came back on the phone this is the only option she gave me, try to switch the party night I had tickets for. Luckily I surfed the DIS while on hold for 20 minutes and knew this was probably bogus info. Next person who entered into equation was Ronda (from the "back team"). She looked into situation while I waited on hold for another 20 minutes. They came back on and said they didn't know what was going on. They would not/could not give me a new Mine Train FP. They said that they could not tell if FPs for earlier times on the 27th were still valid. Honestly they did not seem very concerned. I felt like I was an annoyance to them.
Thank you to the person/poster who explained that they got anytime fps for their canceled Haunted Mansion FP on this thread because that is what I asked for. Kathleen could not/would give me Mine Train FP for the 27 to replace the ones that had been taken away. She did transfer me to Guest Services. I spoke with Vicky at guest services (who was very nice by the way). She did give me passes for Mine Train Sept 27 that could be used any time that day.
I wasted over an hour of my time and was made to feel a bit like I was causing trouble.