WDI designed and built the Yeti, but when the ride was turned over to Operations then AK maintenance assumed responsibility for the ride and all its components. If the maintenance dept has problems or the fix is too technical then they refer to WDW Ride and Show Engineering. Then they try and to fix it or provide solutions to be able to fix it, but just like anything, it will require a lot money and labor. Then AK decides if they want to spend that money to repair it or save money to stay under the budget. Or if it is a real expensive project, spread it out over a couple of years, buy the needed parts one year, then next year, do the installation or necessary work.
So when WDI finishes a project and turns it over to the park, they are no longer responsible for it. That deparment is responsible for the maintenance and upkeep. The Show Quality Standards used to have more power than now and it is basically a punchlist or checklist. It is all about safety and hourly ridership counts.