Does anyone know where is the drain plug for the AT Fluid?

 

Take it to a certified Nissan shop or the dealership. The 5ATs are proprietory and require Nissan fluids and some Nissan parts. Don't try to drain your tranny unless you have the appropriate fluids. Under normal conditions, it shouldn't have to be replaced, anyway.

 

Just got it changed. It was a straight 4 qt fluid change. I am only at 24K so a tranny flush is not necessary. I used nissan j-matic. Cost me $15/qt at the nissan dealer.

I found the plug right under the center of the car.