Hi guys! I'm a relatively new CP working on Expedition Everest, and I thought I'd just drop by and tell you what I've been told about the Yeti. Now, I haven't talked to maintenance directly about the issue, but I've discussed it with a couple of my managers, and they all say pretty much the same thing which is this:
that the only way to fix the Yeti is a 6 month complete shut down of EE, which they will not do until DAK gets another E-ticket attraction, simply because they need a way to keep people coming to the park, and they need to have enough attractions to prevent the lines from getting outrageous. They've also said that they could theoretically repair the Yeti without shutting the ride down by doing it at night after the park closes, but that would take a year and a half (why they haven't been doing that for the PAST year and a half that it's been broken is beyond me, and none of them could explain it either - this option may just be a rumor, then). There's also the option of putting up a tarp in front of the Yeti so they can repair it during the day time and keep the ride open, but they consider that to be worse show than the Disco Yeti. When I asked them to give me the bottom line, most of the said they doubted it would ever be fixed.
Having said that, I do know that they work on it occasionally, because every little thing they do to it pops up on the monitor in the tower where we watch the on-ride cameras. Also, the Yeti was originally looking up when I started, and it's been looking down ever since, so there is SOME sort of movement that happens occasionally (probably when they play with it at night, I assume).
So, that's the info I have. Again, it's not straight from the mouths of the people who work directly with the Yeti, but it's from what I believe to be the next best source. Take it for what you will.