Automatic gearbox

Is it possible to check faultycodes of the automatic gearbox?

I think the gearbox doesnt change as it should because if I drive slowly around 50km and give little push on the gaspedal it feels like it has to high gear for that speed. insteed of 2 like 3 or 4 gear and the rpm goes up and then down again insteed of having the rpm for a litle more time and then change gear with more speed.

Its difficult to explaine so i will make a movie i think = )

I have new gearbox oil!