Not a big EE fan, as it goes so fast been on it only a couple times. But after watching the YouTube videos of the ride . . . the Yeti is right at the end, not way high up in the mountain somewhere! I am guessing his platform raises him at most 15-20 feet off the ground? There's probably a gigantic door where you can simply walk inside the mountain and see the Yeti. This actually makes sense as the Yeti and his related machinery is pretty heavy, I bet he's at the same height as in that making of EE video documentary done by Disney, that would give him the 15-20 needed to reach the last climb of the track.
So . . . to fix the Yeti they don't need to take off the top of the mountain like some have suggested, but at most they'd probably have to open a door, or rebuilt the door that was used to get the Yeti in there by knocking down a wall, which probably doesn't "hold up" the mountain as it is steel girders.
Pathetic. Really. It looks like maintenance has 100% access to the Yeti. If the foundation is the problem, they could removed the Yeti and repour it as the foundations are supposed to be separate. I don't see why they couldn't do this work slowly at night, unless there are some rules/reservations about running the rest of the ride.
After hearing about a lamp post falling over on the ride (a sure sign of going cheap), I am guessing that Disney could fix this issue, but maybe with a month of down time if they did it in a coordinated fashion.
I'd like to believe that there are all of these technical issues because the Yeti AA was groundbreaking, but I think its just TDO being cheap. They couldn't pay somebody to properly install a lamp post, why would they pay for cement for a new foundation?