Aaaah, out of my super long live trip review a couple of weeks ago, I forgot to mention this.
I watched from the stairways (as you could see over the wall) what they were doing.
They were running the boats. When i was there, they were not running "dummies" but they did have 3 CM's (one handicap, possibly testing something in that regard) getting into a boat and taking off.
I know nothing about the length of time it will be closed, but, it doesn't "seem" that it will be long as it seemed to me that they new audio format is in place and may just need tweaking as someone else said.