Which I have a problem with. Proper diagnostic and troubleshooting includes inspection of said parts, and on transmissions, particularly the automatic, visual inspection of the valve body/filter (if it has a accessable filter) to determine if the debris is there and where it is at. On my car, the debris was not on the bottom portion of the filter, but in between the filter and valve body. Dropping the filter is the only way to clean that debris out, which clogged the cooler lines and partially blocked the hydraulic circuit. Just by dropping the filter allowed all of that crap to drop out of the valve body. The magnets on the filter had to be physically removed and cleaned by hand to remove all of the metalized debris that they collected.
If Hyundai does not allow proper troubleshooting and diagnosis, then they have a serious problem when they will see more failures than necessary without proper maintanance (in this case, more frequent filter changes) and close inspection of the internal valve body and serviceable filter. Oftentimes, the repair is a simple one rather than a major deal. In my HD case, a lack of fluid flow meant there was a blockage in the trans, which caused the trans to shift differently and lack cooling capability. Flushing it might not have gotten that out, even if the dealer tech, and/or HMA thought there was a problem with the fluid. Also, SP-III fluid will stay red IF the temperature stays between 160-195 degrees. Any hotter than that, then the fluid will not only brown up, but burn as well. FWD transmissions are known to need more cooling capacity than RWD trans because of their size, but also because of the extra diff parts that are in there; which can increase the heat. If HMA did do the work on my car, they either would have replaced the trans or done nothing; which is typical of them.
Transmission shops also drop the pan in nearly every case where they have a regular service. Most prefer to drop the pan to look at the valve body and see what has collected at the bottom of the pan and to clean that out rather than flushing the system every time. Some transmission shops never flush the system due to the clogging that can happen by flushing the trans. While flushing it is OK, it does not necessarily "clean out" the system as fully as it could.
On my old T-Bird and on my mom's 71 New Yorker, there was a drain plug on the torque converter as well as the one on the pan (if it was there). There, you can actually drain everything without flushing it.