2010 Taco transmission fluid dip stick location

Hey there, I'm new at this and I did try the forum for my question first. So I drive . A 2010 Tacoma and from what I've read my truck had a maintenance free transmission.... What does that mean exactly because yesterday It felt like the tranny was starting to slip. I looked for the dip stick only to learn it doesn't have one? I haven't driven it since for fear that I could damage it more. But, so I need to worry if it's "maintenance free"? Any advice would be appreciated.

 

As far as I know there isn't one.