Boomers! Family Fun Center on Long Island has the same Zamperla kiddie coaster model and it too was taken down after a few months of operation then rebuilt. And this was in the spring or summer of 1999 also. Seeing before and after pictures, they also added a catwalk and chain sled that weren't part of the original. As you can imagin, if the train got stuck on the lift hill, although its small, it would be difficult to get the riders off.
I remember at Coaster Celebration that year them mentioning that it wouldn't be open for ERT because they had to dismantle it. I remember being pretty confused.
Pete