Since we probably won't know what the "uh-oh" was until after opening I'd like to put some guesses down in writing to see if any of them end up being accurate.
- One of the drop-tracks activated prematurely before a train was fully locked in place causing minor damage to one of the trains.
- The track-switch following the spike experienced a sensor failure and remained in its "forward" state resulting in a train zipping backwards through the fluffy portion of the ride track.
- A small electrical fire in the station caused minor damage to theming elements.
- The LSMs on the backwards launch after the spike failed to activate causing a train to valley in between the helix and the entrance to the showbuilding