=How do you check the transmission fliud? I can't find a dipstick and the manual just says to have a qualified mechanic check and add fluid as needed.
The transmissions are in fact sealed units. The drain plug bolt has a small fill hole plug within the head. It requires a Torx bit.
Drain Fluid: Remove drain plug bolt and drain.
Fill Fluid: Install drain plug bolt, remove fill hole plug. Install a 1/8" NPT nipple in lieu of the fill hole plug, and a hose and pump on the nipple. Pump in the same amount of fluid that was drained out, starting with about 5Qt. Crimp the hose, run the engine for 30 seconds only. Remove the crimp, pump the rest in. Remove the pump, hose, and nipple, and install the fill hole plug.
Check Fluid: With the engine running up to operating temperature and fill hole plug installed, remove and install the nipple. Ensure that a light drip comes out of the nipple. Heavy flow means too much, no drip means not enough. I recommend measuring the drained fluid to be spot on with the fluid to be filled (if you're changing it).
I would pick up the workshop manual and follow the instructions to a 'T. This procedure is more of an art than it is 'bolt-on application'.
Even better, I would say its one of the few times going to a dealership is a reasonable choice for transmission fluid changes and flushes. Of course if you have zero interest in a change or flush, ignore everything I mentioned but the check part sir!
